International economics: theory and policy

International Economics Theory and Policy SIXTH EDITION

Paul R. Krugman Princeton University

Maurice Obstfeld University of California, Berkeley BAD GUY NOTICE: I only scanned this book to help my fellow students. If you like the book, go buy it. However, if you can't afford it, or you're simply too tired to go to the library every time you need to read it or copy pages from it, then don't complain about the quality.

Dear Mr Krugman, dear Mr Obstfeld, I honestly advise you to offer us a downloadable PDF-Version of your book. It would be a lot cheaper for you and us, and a lot easier to get. Maybe for the next time. Welcome to the new Millenium!

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For Robin and Leslie Ann

Editor-in-Chief: Denise Clinton Executive Development Manager: Sylvia Mallory Development Editor: Jane Tufts Web Development: Melissa Honig Managing Editor: James Rigney Production Supervisor: Katherine Watson Design Manager: Regina Kolenda Text Design, Electronic Composition, and Project Management: Elm Street Publishing Services, Inc. Cover Designer: Regina Kolenda Cover Image: © Digital Vision Ltd. Supplements Editor: Andrea Basso Marketing Manager: Adrienne D'Ambrosio Manufacturing Coordinator: Hugh Crawford International Economics: Theory and Policy Copyright © 2003 by Paul R. Krugman and Maurice Obstfeld All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written consent of the publisher. For information on obtaining permission for the use of material from this work, please submit a written request to Pearson Education, Inc., Rights and Contracts Department, 75 Arlington St., Suite 300, Boston, MA 02116 or fax your request to (617) 848-7047. Printed in the United States of America. ISBN: 0-321-11639-9 WORLD STUDENT SERIES This edition may be sold only in those countries to which it is consigned by Pearson Education International. It is not to be re-exported and it is not for sale in the U.S.A. or Canada. 03 02

BRIEF CONTENTS Contents Preface

1

Introduction

Part I International Trade Theory 2 3 4 5 6 7

Labor Productivity and Comparative Advantage: The Ricardian Model Specific Factors and Income Distribution Resources and Trade: The Heckscher-Ohlin Model The Standard Trade Model Economies of Scale, Imperfect Competition, and International Trade International Factor Movements

Part 2 International Trade Policy 8 The Instruments of Trade Policy 9 The Political Economy of Trade Policy 10 Trade Policy in Developing Countries 11 Controversies in Trade Policy

Part 3 Exchange Rates and Open-Economy Macroeconomics 12 National Income Accounting and the Balance of Payments 1 3 Exchange Rates and the Foreign Exchange Market: An Asset Approach 14 Money, Interest Rates, and Exchange Rates 15 Price Levels and the Exchange Rate in the Long Run 16 Output and the Exchange Rate in the Short Run 17 Fixed Exchange Rates and Foreign Exchange Intervention

Part 4 International Macroeconomic Policy 18 The International Monetary System, 1870-1973 19 Macroeconomic Policy and Coordination under Floating Exchange Rates 20 Optimum Currency Areas and the European Experience 2 1 The Global Capital Market: Performance and Policy Problems 2 2 Developing Countries: Growth, Crisis, and Reform

vii xxii

1

9 10 38 67 93 120 160

185 186 218 255 276

293 294 324 357 388 433 481

53 I 532 568 604 636 665

vi

Brief Contents

Mathematical Postscripts Postscript to Chapter 3: The Specific Factors Model Postscript to Chapter 4: The Factor Proportions Model Postscript to Chapter 5: The Trading World Economy Postscript to Chapter 6: The Monopolistic Competition Model Postscript to Chapter 21: Risk Aversion and International Portfolio Diversification

707 708 714 717

Index

737

726 728

CONTENTS Preface

1

Introduction What Is International Economics About? The Gains from Trade The Pattern of Trade How Much Trade? The Balance of Payments Exchange Rate Determination International Policy Coordination The International Capital Market International Economics: Trade and Money

Part I International Trade Theory 2

xxii

I 3 3 4 5 6 6 7 7 8

9

Labor Productivity and Comparative Advantage: The Ricardian Model

10

The Concept of Comparative Advantage A One-Factor Economy Production Possibilities Relative Prices and Supply Trade in a One-Factor World Box: Comparative Advantage in Practice: The Case of Babe Ruth Determining the Relative Price after Trade The Gains From Trade A Numerical Example Relative Wages Misconceptions about Comparative Advantage Productivity and Competitiveness The Pauper Labor Argument Exploitation Box: Do Wages Reflect Productivity? Comparative Advantage with Many Goods Setting Up the Model Relative Wages and Specialization Determining the Relative Wage in the Multigood Model Adding Transport Costs and Nontraded Goods Empirical Evidence on the Ricardian Model Summary

10 12 12 14 14 16 16 19 20 22 23 23 24 24 25 26 26 27 28 30 31 34 VII

viii

Contents

3

Specific Factors and Income Distribution

38

The Specific Factors Model Assumptions of the Model Box: What Is a Specific Factor? Production Possibilities Prices, Wages, and Labor Allocation Relative Prices and the Distribution of Income International Trade in the Specific Factors Model Resources and Relative Supply Trade and Relative Prices The Pattern of Trade Income Distribution and the Gains From Trade The Political Economy of Trade: A Preliminary View Optimal Trade Policy Income Distribution and Trade Politics Box: Specific Factors and the Beginnings of Trade Theory Summary

39 39 40 40 44 49 50 51 52 53 54 57 57 58 59 60

Appendix: Further Details on Specific Factors

63

Marginal and Total Product Relative Prices and the Distribution of Income

4

5

63 64

Resources and Trade: The Heckscher-Ohlin Model

67

A Model of a Two-Factor Economy Assumptions of the Model Factor Prices and Goods Prices Resources and Output Effects of International Trade Between Two-Factor Economies Relative Prices and the Pattern of Trade Trade and the Distribution of Income Factor Price Equalization Case Study: North-South Trade and Income Inequality Empirical Evidence on the Heckscher-Ohlin Model Testing the Heckscher-Ohlin Model , Implications of the Tests Summary

68 68 69 72 75 76 76 78 80 82 82 85 86

Appendix: Factor Prices, Goods Prices, and Input Choices

89

Choice of Technique Goods Prices and Factor Prices

89 91

The Standard Trade Model

93

A Standard Model of a Trading Economy Production Possibilities and Relative Supply Relative Prices and Demand The Welfare Effect of Changes in the Terms of Trade

94 94 95 98

Contents Determining Relative Prices Economic Growth: A Shift of the RS Curve Growth and the Production Possibility Frontier Relative Supply and the Terms of Trade . International Effects of Growth Case Study: Has the Growth of Newly Industrializing Countries Hurt Advanced Nations? International Transfers of Income: Shifting the RD Curve The Transfer Problem Effects of a Transfer on the Terms of Trade Presumptions about the Terms of Trade Effects of Transfers Case Study: The Transfer Problem and the Asian Crisis Tariffs and Export Subsidies: Simultaneous Shifts in RS and RD Relative Demand and Supply Effects of a Tariff Effects of an Export Subsidy Implications of Terms of Trade Effects: Who Gains and Who Loses? Summary

103 104 105 105 107 108 109 109 110 111 113

Appendix: Representing International Equilibrium with Offer Curves

117

Deriving a Country's Offer Curve International Equilibrium

6

Economies of Scale, Imperfect Competition, and International Trade Economies of Scale and International Trade: An Overview Economies of Scale and Market Structure The Theory of Imperfect Competition Monopoly: A Brief Review Monopolistic Competition Limitations of the Monopolistic Competition Model Monopolistic Competition and Trade The Effects of Increased Market Size Gains from an Integrated Market: A Numerical Example Economies of Scale and Comparative Advantage The Significance of Intraindustry Trade Why Intraindustry Trade Matters Case Study: Intraindustry Trade in Action: The North American Auto Pact of 1964 Dumping The Economics of Dumping Case Study: Antidumping as Protectionism Reciprocal Dumping The Theory of External Economies Specialized Suppliers Labor Market Pooling Knowledge Spillovers

98 99 100 101 101

117 118

120 120 122 123 123 126 131 132 132 133 136 139 140 141 142 142 145 146 147 147 148 149

ix

Contents

7

External Economies and Increasing Returns

150

External Economies and International Trade

150

External Economies and the Pattern of Trade Trade and Welfare with External Economies Dynamic Increasing Returns

150 151 152

Box: Tinseltown Economics Summary

153 155

Appendix: Determining Marginal Revenue

158

International Factor Movements

160

International Labor Mobility

161

A One-Good Model Without Factor Mobility International Labor Movement Extending the Analysis

Case Study: Wage Convergence in the Age of Mass Migration Case Study: Immigration and the U.S. Economy International Borrowing and Lending Intertemporal Production Possibilities and Trade The Real Interest Rate Intertemporal Comparative Advantage

Direct Foreign Investment and Multinational Firms Box: Does Capital Movement to Developing Countries Hurt Workers in High-Wage Countries? The Theory of Multinational Enterprise Multinational Firms in Practice

165 166 167 167 168 169

169 170 172 173

Case Study: Foreign Direct Investment in the United States Box: Taken for a Ride? Summary

175 177 177

Appendix: More on Intertemporal Trade

181

Part 2 International Trade Policy 8

161 162 163

185

The Instruments of Trade Policy

186

Basic Tariff Analysis

186

Supply, Demand, and Trade in a Single Industry Effects of a Tariff Measuring the Amount of Protection

Costs and Benefits of a Tariff

187 189 190

192

Consumer and Producer Surplus Measuring the Costs and Benefits

192 195

Other Instruments of Trade Policy

196

Export Subsidies: Theory

Case Study: Europe's Common Agricultural Policy

197

198

Contents Import Quotas: Theory Case Study: An Import Quota in Practice: U.S. Sugar Voluntary Export Restraints Case Study: A Voluntary Export Restraint in Practice: Japanese Autos Local Content Requirements Box: American Buses, Made in Hungary Other Trade Policy Instruments The Effects of Trade Policy: A Summary Summary

200 200 202 203 203 204 205 206 206

Appendix I: Tariff Analysis in General Equilibrium

210

A Tariff in a Small Country A Tariff in a Large Country

210 212

Appendix II: Tariffs and Import Quotas in the Presence of Monopoly The Model with Free Trade The Model with a Tariff The Model with an Import Quota Comparing a Tariff and a Quota

9

M

214 214 215 216 216

The Political Economy of Trade Policy

218

The Case for Free Trade Free Trade and Efficiency Additional Gains from Free Trade Political Argument for Free Trade Case Study: The Gains from 1992 National Welfare Arguments Against Free Trade The Terms of Trade Argument for a Tariff The Domestic Market Failure Argument Against Free Trade How Convincing Is the Market Failure Argument? Box: Market Failures Cut Both Ways: The Case of California Income Distribution and Trade Policy Electoral Competition Collective Action Modeling the Political Process Who Gets Protected? Box: Politicians for Sale: Evidence from the 1990s International Negotiations and Trade Policy The Advantages of Negotiation International Trade Agreements: A Brief History The Uruguay Round Trade Liberalization From the GATT to the WTO Benefits and Costs Box: Settling a Dispute—and Creating One Preferential Trading Agreements

218 219 219 221 221 223 223 224 226 227 229 229 230 231 232 233 234 235 237 239 239 240 241 242 243

xi

xii

Contents

10

I I

Box: Free Trade Area versus Customs Union Box: Do Trade Preferences Have Appeal? Case Study: Trade Diversion in South America Summary Appendix: Proving that the Optimum Tariff Is Positive Demand and Supply The Tariff and Prices The Tariff and Domestic Welfare

252 252 252 253

Trade Policy in Developing Countries

255

Import-Substituting Industrialization The Infant Industry Argument Promoting Manufacturing Through Protection Case Study: The End of Import Substitution in Chile Results of Favoring Manufacturing: Problems of Import-Substituting Industrialization Problems of the Dual Economy The Symptoms of Dualism Case Study: Economic Dualism in India Dual Labor Markets and Trade Policy Trade Policy as a Cause of Economic Dualism Export-Oriented Industrialization: The East Asian Miracle The Facts of Asian Growth Trade Policy in the HPAEs Box: China's Boom Industrial Policy in the HPAEs Other Factors in Growth Summary

256 256 258 260

Controversies in Trade Policy Sophisticated Arguments for Activist Trade Policy Technology and Externalities Imperfect Competition and Strategic Trade Policy Case Study: When the Chips Were Up Globalization and Low-Wage Labor The Anti-Globalization Movement Trade and Wages Revisited Labor Standards and Trade Negotiations Environmental and Cultural Issues The WTO and National Independence Case Study: The Shipbreakers of Alang Summary

244 245 246 247

261 263 263 264 264 267 267 268 269 270 270 271 272

276 276 277 278 282 283 284 285 287 288 288 289 290

Contents

Part 3 Exchange Rates and Open-Economy Macroeconomics I2

I3

293

National Income Accounting and the Balance of Payments

294

The National Income Accounts

295

National Product and National Income Capital Depreciation, International Transfers, and Indirect Business Taxes Gross Domestic Product National Income Accounting for an Open Economy Consumption Investment t Government Purchases The National Income Identity for an Open Economy An Imaginary Open Economy The Current Account and Foreign Indebtedness Saving and the Current Account Private and Government Saving Case Study: Government Deficit Reduction May Not Increase the Current Account Surplus The Balance of Payment Accounts Examples of Paired Transactions The Fundamental Balance of Payments Identity The Current Account, Once Again The Capital Account The Financial Account The Statistical Discrepancy Official Reserve Transactions Box: The Mystery of the Missing Surplus Case Study: Is the United States the World's Biggest Debtor? Summary

296

306 307 309 310 310 312 312 313 313 314 316 320

Exchange Rates and the Foreign Exchange Market: An Asset Approach

324

Exchange Rates and International Transactions Domestic and Foreign Prices Exchange Rates and Relative Prices The Foreign Exchange Market The Actors Box: A Tale of Two Dollars Characteristics of the Market Spot Rates and Forward Rates

325 325 327 328 328 329 330 331

297 298 299 299 299 299 300 300 301 303 305

xiii

xiv

Contents

I4

Foreign Exchange Swaps Future and Options The Demand for Foreign Currency Assets Assets and Asset Returns Risk and Liquidity Interest Rates Exchange Rates and Asset Returns ' A Simple Rule Return, Risk, and Liquidity in the Foreign Exchange Market Equilibrium in the Foreign Exchange Market Interest Parity: The Basic Equilibrium Condition How Changes in the Current Exchange Rate Affect Expected Returns The Equilibrium Exchange Rate Interest Rates, Expectations, and Equilibrium The Effect of Changing Interest Rates on the Current Exchange Rate The Effect of Changing Expectations on the Current Exchange Rate Box: The Perils of Forecasting Exchange Rates Summary

332 333 334 334 335 336 337 338 340 341 341 342 344 346 347 347 349 350

Appendix: Forward Exchange Rates and Covered Interest Parity

354

Money, Interest Rates, and Exchange Rates

357

Money Defined: A Brief Review Money as a Medium of Exchange Money as a Unit of Account Money as a Store of Value What Is Money? How the Money Supply Is Determined The Demand for Money by Individuals Expected Return Risk Liquidity

358 358 358 358 359 -359 359 360 360 361

Aggregate Money Demand The Equilibrium Interest Rate: The Interaction of Money Supply and Demand

361 362

Equilibrium in the Money Market Interest Rates and the Money Supply Output and the Interest Rate The Money Supply and the Exchange Rate in the Short Run Linking Money, the Interest Rate, and the Exchange Rate U.S. Money Supply and the Dollar/Euro Exchange Rate Europe's Money Supply and the Dollar/Euro Exchange Rate Money, the Price Level, and the Exchange Rate in the Long Run Money and Money Prices The Long-Run Effects of Money Supply Changes Empirical Evidence on Money Supplies and Price Levels

362 365 366 366 367 369 370 373 373 374 375

r Contents

j:

|

t

I5

• \ ; [ ; ! ' : •

16

Money and the Exchange Rate in the Long Run Box: Inflation and Money-Supply Growth in Latin America Inflation and Exchange Rate Dynamics Short-Run Price Rigidity versus Long-Run Price Flexibility Box: Money Supply Growth and Hyperinflation in Bolivia Permanent Money Supply Changes and the Exchange Rate Exchange Rate Overshooting Summary

376 377 378 378 380 381 383 384

Price Levels and the Exchange Rate in the Long Run

388

The Law of One Price Purchasing Power Parity The Relationship between PPP and the Law of One Price Absolute PPP and Relative PPP A Long-Run Exchange Rate Model Based on PPP , The Fundamental Equation of the Monetary Approach Ongoing Inflation, Interest Parity, and PPP The Fisher Effect Empirical Evidence on PPP and the Law of One Price Box: Some Meaty Evidence on the Law of One Price Explaining the Problems with PPP Trade Barriers and Nontradables Departures from Free Competition Box: Hong Kong's Surprisingly High Inflation International Differences in Price Level Measurement PPP in the Short Run and in the Long Run Case Study: Why Price Levels Are Lower in Poorer Countries Beyond Purchasing Power Parity: A General Model of Long-Run Exchange Rates The Real Exchange Rate Box: Sticky Prices and the Law of One Price: Evidence from Scandinavian Duty-Free Shops Demand, Supply, and the Long-Run Real Exchange Rate Nominal and Real Exchange Rates in Long-Run Equilibrium Case Study: Why Has the Yen Kept Rising? International Interest Rate Differences and the Real

389 389 390 391 392 392 394 396 400 402 404 404 405 406 408 408 409 411 411 412 415 416 419

Exchange Rate Real Interest Parity Summary Appendix: The Fisher Effect, the Interest Rate, and the Exchange Rate under the Flexible-Price Monetary Approach

421 423 424 430

Output and the Exchange Rate in the Short Run

433

Determinants of Aggregate Demand in an Open Economy

434

XV

xvi

Contents

17

Determinants of Consumption Demand Determinants of the Current Account How Real Exchange Rate Changes Affect the Current Account How Disposable Income Changes Affect the Current Account The Equation of Aggregate Demand The Real Exchange Rate and Aggregate Demand Real Income and Aggregate Demand How Output Is Determined in the Short Run Output Market Equilibrium in the Short Run: The DD Schedule Output, the Exchange Rate, and Output Market Equilibrium Deriving the DD Schedule Factors that Shift the DD Schedule Asset Market Equilibrium in the Short Run: The AA Schedule Output, the Exchange Rate, and Asset Market Equilibrium Deriving the AA Schedule Factors that Shift the AA Schedule Short-Run Equilibrium for an Open Economy: Putting the DD and AA Schedules Together Temporary Changes in Monetary and Fiscal Policy Monetary Policy Fiscal Policy Policies to Maintain Full Employment Inflation Bias and Other Problems of Policy Formulation Permanent Shifts in Monetary and Fiscal Policy A Permanent Increase in the Money Supply Adjustment to a Permanent Increase in the Money Supply A Permanent Fiscal Expansion Macroeconomic Policies and the Current Account Box: The Dollar Exchange Rate and the U.S. Economic Slowdown of 2000-2001 Gradual Trade Flow Adjustment and Current Account Dynamics The J-Curve Exchange Rate Pass-Through and Inflation Summary

434 435 436 437 437 437 438 438

Appendix I: The IS-LM Model and the DD-AA Model Appendix II: Intertemporal Trade and Consumption Demand Appendix III: The Marshall-Lerner Condition and Empirical Estimates of Trade Elasticities

470

440 440 441 443 445 445 446 446 448 450 451 451 452 455 456 456 456 458 460 461 463 464 465 466

475 477

Fixed Exchange Rates and Foreign Exchange Intervention

481

Why Study Fixed Exchange Rates?

481

Contents

Central Bank Intervention and the Money Supply

482

The Central Bank Balance Sheet and the Money Supply Foreign Exchange Intervention and the Money Supply Sterilization The Balance of Payments and the Money Supply How the Central Bank Fixes the Exchange Rate Foreign Exchange Market Equilibrium under a Fixed Exchange Rate Money Market Equilibrium under a Fixed Exchange Rate A Diagrammatic Analysis Stabilization Policies with a Fixed Exchange Rate Monetary Policy Fiscal Policy Changes in the Exchange Rate Adjustment to Fiscal Policy and Exchange Rate Changes Case Study: Fixing the Exchange Rate to Escape from a Liquidity Trap Balance of Payments Crises and Capital Flight Managed Floating and Sterilized Intervention Perfect Asset Substitutability and the Ineffectiveness of Sterilized Intervention Box: Mexico's 1994 Balance of Payments Crisis Foreign Exchange Market Equilibrium under Imperfect Asset Substitutability The Effects of Sterilized Intervention with Imperfect Asset Substitutability Evidence on the Effects of Sterilized Intervention The Signaling Effect of Intervention Reserve Currencies in the World Monetary System The Mechanics of a Reserve Currency Standard The Asymmetric Position of the Reserve Center The Gold Standard The Mechanics of a Gold Standard Symmetric Monetary Adjustment under a Gold Standard Benefits and Drawbacks of the Gold Standard The Bimetallic Standard The Gold Exchange Standard Summary

486 487 488 489 490

508 510 510 511 512 512 513 513 514 515 516 516 517

Appendix I: Equilibrium in the Foreign Exchange Market with Imperfect Asset Substitutability

522

Demand Supply Equilibrium

Appendix II: The Monetary Approach to the Balance of Payments Appendix III: The Timing of Balance of Payments Crises

491 491 492 494 494 495 496 498 499 502 505 505 506 507

522 523 523

525 527

xvii

xviii

Contents

Part 4 International Macroeconomic Policy I8

I9

53 I

The International Monetary System, 1870-1973

532

Macroeconomic Policy Goals in an Open Economy Internal Balance: Full Employment and Price-Level Stability External Balance: The Optimal Level of the Current Account International Macroeconomic Policy under the Gold Standard, 1870-1914 Origins of the Gold Standard External Balance under the Gold Standard The Price-Specie-Flow Mechanism The Gold Standard "Rules of the Game": Myth and Reality Box: Hume versus the Mercantilists Internal Balance under the Gold Standard Case Study: The Political Economy of Exchange Rate Regimes: Conflict over America's Monetary Standard During the 1890s The Interwar Years, 1918-1939 The German Hyperinflation The Fleeting Return to Gold International Economic Disintegration Case Study: The International Gold Standard and the Great Depression The Bretton Woods System and the Internationa] Monetary Fund Goals and Structure of the IMF Convertibility Internal and External Balance under the Bretton Woods System The Changing Meaning of External Balance Speculative Capital Flows and Crises Analyzing Policy Options under the Bretton Woods System Maintaining Internal Balance Maintaining External Balance Expenditure-Changing and Expenditure-Switching Policies

533 533 534 537 537 537 538 539 540 541 541 542 543 543 544 545 546 547 548 549 550 550 551 552 553 554

The External Balance Problem of the United States Case Study: The Decline and Fall of the Bretton Woods System Worldwide Inflation and the Transition to Floating Rates Summary

556 557 561 564

Macroeconomic Policy and Coordination under Floating Exchange Rates

568

The Case for Floating Exchange Rates Monetary Policy Autonomy Symmetry

568 569 570

Contents Exchange Rates as Automatic Stabilizers The Case Against Floating Exchange Rates Discipline Destabilizing Speculation and Money Market Disturbances Injury to International Trade and Investment Uncoordinated Economic Policies The Illusion of Greater Autonomy Case Study: Exchange Rate Experience Between the Oil Shocks, 1973-1980 Macroeconomic Interdependence under a Floating Rate Case Study: Disinflation, Growth, Crisis, and Recession, 1980-2002 What Has Been Learned Since 1973? Monetary Policy Autonomy Symmetry The Exchange Rate as an Automatic Stabilizer Discipline Destabilizing Speculation International Trade and Investment Policy Coordination

I I I I I [,• [• i • »

20

571 573 573 574 575 576 576 577 582

t

586 590 590 592 592 593 594 594 595

Are Fixed Exchange Rates Even an Option for Most Countries? Directions for Reform Summary Appendix: International Policy Coordination Failures

596 596 597 601

Optimum Currency Areas and the European Experience

604

How the European Single Currency Evolved

604

European Currency Reform Initiatives, 1969-1978 The European Monetary System, 1979-1998 German Monetary Dominance and the Credibility Theory of the EMS The EU "1992" Initiative European Economic and Monetary Union The Euro and Economic Policy in the Euro Zone The Maastricht Convergence Criteria and the Stability and Growth Pact The European System of Central Banks Box: Designing and Naming a New Currency The Revised Exchange Rate Mechanism The Theory of Optimum Currency Areas Economic Integration and the Benefits of a Fixed Exchange Rate Area: The GG Schedule Economic Integration and the Costs of a Fixed Exchange Rate Area: The LL Schedule

605 607 609 610 612 613 613 615 616 616 617 618 620

xix

XX

Contents

The Decision to Join a Currency Area: Putting the GG and LL Schedules Together What Is an Optimum Currency Area? Case Study: Is Europe an Optimum Currency Area? Box: How Much Trade Do Currency Unions Create? The Future of EMU Summary

2I

The Global Capital Market: Performance and Policy Problems The International Capital Market and the Gains from Trade Three Types of Gain from Trade Risk Aversion Portfolio Diversification as a Motive for International Asset Trade The Menu of International Assets: Debt Versus Equity International Banking and the International Capital Market The Structure of the International Capital Market Growth of the International Capital Market Offshore Banking and Offshore Currency Trading The Growth of Eurocurrency Trading Regulating International Banking The Problem of Bank Fai lure Difficulties in Regulating International Banking International Regulatory Cooperation Box: The Banco Ambrosiano Collapse Case Study: The Day the World Almost Ended How Well Has the International Capital Market Performed? The Extent of International Portfolio Diversification The Extent of Intertemporal Trade Onshore-Offshore Interest Differentials The Efficiency of the Foreign Exchange Market Summary

22

Developing Countries: Growth, Crisis, and Reform Income, Wealth, and Growth in the World Economy The Gap Between Rich and Poor Has the World Income Gap Narrowed over Time? Structural Features of Developing Countries Developing Country Borrowing and Debt The Economics of Capital Inflows to Developing Countries The Problem of Default Alternative Forms of Capital Inflow Latin America: From Crisis to Uneven Reform Inflation and the 1980s Debt Crisis in Latin America Box: The Simple Algebra of Moral Hazard

622 624 625 628 630 632

636 637 637 638 639 640 640 641 643 643 644 647 647 649 650 651 653 655 655 656 657 658 662

665 665 666 666 668 671 672 672 675 676 678 679

Contents

Case Study: Argentina's Economic Stagnation Reforms, Capital Inflows, and the Return of Crisis East Asia: Success and Crisis The East Asian Economic Miracle Box: What Did Asia Do Right? Asian Weaknesses The Asian Financial Crisis Crises in Other Developing Regions Case Study: Can Currency Boards Make Fixed Exchange Rates Credible? Lessons of Developing Country Crises Reforming the World's Financial "Architecture" Capital Mobility and the Trilemma of the Exchange Rate Regime "Prophylactic" Measures Coping with Crisis A Confused Future Summary

695 697 698 699 701 702 702 702

Mathematical Postscripts

707

Postscript to Chapter 3: The Specific Factors Model Factor Prices, Costs, and Factor Demands Factor Price Determination in the Specific Factors Model Effects of a Change in Relative Prices Postscript to Chapter 4: The Factor Proportions Model The Basic Equations in the Factor Proportions Model Goods Prices and Factor Prices Factor Supplies and Outputs Postscript to Chapter 5: The Trading World Economy Supply, Demand, and Equilibrium World Equilibrium Production and Income Income, Prices, and Utility Supply, Demand, and the Stability of Equilibrium Effects of Changes in Supply and Demand The Method of Comparative Statics Economic Growth The Transfer Problem A Tariff Postscript to Chapter 6: The Monopolistic Competition Model Postscript to Chapter 21: Risk Aversion and International Portfolio Diversification An Analytical Derivation of the Optimal Portfolio A Diagrammatic Derivation of the Optimal Portfolio The Effects of Changing Rates of Return

708 708 710 712 714 714 715 715 717 717 717 717 718 719 721 721 722 723 724 726

Index

681 684 687 687 689 689 691 692

728 728 729 732 737

XXI

PREFACE At the start of the twenty-first century, international aspects of economics remain as important and controversial as ever. In the last decade alone, major currency and Financial crises have rocked industrializing countries from East Asia to Latin America; countries in Europe have given up their national currencies in favor of a common currency, the euro; and growing trade and financial linkages between industrial and developing countries have sparked debate and even open protest inspired by claims that economic "globalization" has worsened worldwide ills ranging from poverty to pollution. Although the United States is more self-sufficient than nations with smaller economies, problems of international economic policy have assumed primacy and now occupy a prominent place on newspapers' front pages. Recent general developments in the world economy raise concerns that have preoccupied international economists for more than two centuries, such as the nature of the international adjustment mechanism and the merits of free trade compared with protection. As always in international economics, however, the interplay of events and ideas has led to new modes of analysis. Three notable examples of recent progress are the asset market approach to exchange rates; new theories of foreign trade based on increasing returns and market structure rather than comparative advantage; and the intertemporal analysis of international capital flows, which has been central both in refining the concept of "external balance" and in examining the determinants of developing country borrowing and default. The idea of writing this book came out of our experience in teaching international economics to undergraduates and business students since the late 1970s. We perceived two main challenges in teaching. The first was to communicate to students the exciting intellectual advances in this dynamic field. The second was to show how the development of international economic theory has traditionally been shaped by the need to understand the changing world economy and analyze actual problems in international economic policy. We found that published textbooks did not adequately meet these challenges. Too often, international economics textbooks confront students with a bewildering array of special models and assumptions from which basic lessons are difficult to extract. Because many of these special models are outmoded, students are left puzzled about the real-world relevance of the analysis. As a result, many textbooks often leave a gap between the somewhat antiquated material to be covered in class and the exciting issues that dominate current research and policy debates. That gap has widened dramatically as the importance of international economic problems—and enrollments in international economics courses— have grown. This book is our attempt to provide an up-to-date and understandable analytical framework for illuminating current events and bringing the excitement of international economics into the classroom. In analyzing both the real and monetary sides of the subject, our approach has been to build up, step by step, a simple, unified framework for communicating the grand traditional insights as well as the newest findings and approaches. To help the student grasp and retain the underlying logic of international economics, we motivate the theoretical development at each stage by pertinent data or policy questions. xxii

Preface

The Place of This Book in the Economics Curriculum Students assimilate international economics most readily when it is presented as a method of analysis vitally linked to events in the world economy, rather than as a body of abstract theorems about abstract models. Our goal has therefore been to stress concepts and their application rather than theoretical formalism. Accordingly, the book does not presuppose an extensive background in economics. Students who have had a course in economic principles will find the book accessible, but students who have taken further courses in microeconomics or macroeconomics will find an abundant supply of new material. Specialized appendices and mathematical postscripts have been included to challenge the most advanced students. We follow the standard practice of dividing the book into two halves, devoted to trade and to monetary questions. Although the trade and monetary portions of international economics are often treated as unrelated subjects, even within one textbook, similar themes and methods recur in both subfields. One example is the idea of gains from trade, which is important in understanding the effects of free trade in assets as well as free trade in goods. International borrowing and lending provide another example. The process by which countries trade present for future consumption is best understood in terms of comparative advantage (which is why we introduce it in the book's first half), but the resulting insights deepen understanding of the external macroeconomic problems of developing and developed economies alike. We have made it a point to illuminate connections between the trade and monetary areas when they arise. At the same time, we have made sure that the book's two halves are completely selfcontained. Thus, a one-semester course on trade theory can be based on Chapters 2 through 11, and a one-semester course on international monetary economics can be based on Chapters 12 through 22. If you adopt the book for a full-year course covering both subjects, however, you will find a treatment that does not leave students wondering why the principles underlying their work on trade theory have been discarded over the winter break.

Some Distinctive Features of International Economics: Theory and Policy This book covers the most important recent developments in international economics without shortchanging the enduring theoretical and historical insights that have traditionally formed the core of the subject. We have achieved this comprehensiveness by stressing how recent theories have evolved from earlier findings in response to an evolving world economy. Both the real trade portion of the book (Chapters 2 through 11) and the monetary portion (Chapters 12 through 22) are divided into a core of chapters focused on theory, followed by chapters applying the theory to major policy questions, past and current. In Chapter 1 we describe in some detail how this book addresses the major themes of international economics. Here we emphasize several of the newer topics that previous authors failed to treat in a systematic way. Asset Market Approach to Exchange Rate Determination The modern foreign exchange market and the determination of exchange rates by national interest rates and expectations are at the center of our account of open-economy

xxiii

xxiv

Preface

macroeconomics. The main ingredient of the macroeconomic model we develop is the interest parity relation (augmented later by risk premiums). Among the topics we address using the model are exchange rate "overshooting"; behavior of real exchange rates; balanceof-payments crises under fixed exchange rates; and the causes and effects of central bank intervention in the foreign exchange market. Increasing Returns and Market Structure

After discussing the role of comparative advantage in promoting trade and gains from trade, we move to the frontier of research (in Chapter 6) by explaining how increasing returns and product differentiation affect trade and welfare. The models explored in this discussion capture significant aspects of reality, such as intraindustry trade and shifts in trade patterns due to dynamic scale economies. The models show, too, that mutually beneficial trade need not be based on comparative advantage. Politics and Theory of Trade Policy

Starting in Chapter 3, we stress the effect of trade on income distribution as the key political factor behind restrictions on free trade. This emphasis makes it clear to students why the prescriptions of the standard welfare analysis of trade policy seldom prevail in practice. Chapter 11 explores the popular notion that governments should adopt activist trade policies aimed at encouraging sectors of the economy seen as crucial. The chapter includes a theoretical discussion of such trade policy based on simple ideas from game theory. International Macroeconomic Policy Coordination

Our discussion of international monetary experience (Chapters 18, 19, 20, and 22) stresses the theme that different exchange rate systems have led to different policy coordination problems for their members. Just as the competitive gold scramble of the interwar years showed how beggar-thy-neighbor policies can be self-defeating, the current float challenges national policymakers to recognize their interdependence and formulate policies cooperatively. Chapter 19 presents a detailed discussion of this very topical problem of the current system. The World Capital Market and Developing Countries

A broad discussion of the world capital market is given in Chapter 21, which takes up the welfare implications of international portfolio diversification as well as problems of prudential supervision of offshore financial institutions. Chapter 22 is devoted to the long-term growth prospects and to the specific macroeconomic stabilization and liberalization problems of industrializing and newly industrialized countries. The chapter reviews emerging market crises and places in historical perspective the interactions among developing country borrowers, developed country lenders, and official financial institutions such as the International Monetary Fund. International Factor Movements

In Chapter 7 we emphasize the potential substitutability of international trade and international movements of factors of production. A feature in the chapter is our analysis of international borrowing and lending as intertemporal trade, that is, the exchange of present con-

Preface

sumption for future consumption. We draw on the results of this analysis in the book's second half to throw light on the macroeconomic implications of the current account.

New to the Sixth Edition For this sixth edition of International Economics: Theory and Policy, we have extensively redesigned several chapters. These changes respond both to users' suggestions and to some important developments on the theoretical and practical sides of international economics. The most far-reaching changes are the following: Chapter 9, The Political Economy of Trade Policy This chapter now includes the role of special-interest payments in influencing political decisions over trade policy. Coverage of the World Trade Organization is brought up to date. Chapter I I, Controversies in Trade Policy A new title signals that this chapter expands its coverage beyond its predecessor's focus on strategic trade policy. In addition, Chapter 11 now covers the recent globalization debate—including the effects of trade on income distribution and the environment, as well as the role of international labor standards. Chapter 12, National Income Accounting and the Balance of Payments The revised Chapter 12 reflects the new balance of payments accounting conventions adopted by the United States and other countries. Chapter 18, The International Monetary System, 1870-1973 This chapter now pays more attention to the political economy of exchange rate regimes, using as an example the battle over the gold standard that dominated American politics in the late nineteenth century. Chapter 19, Macroeconomic Policy and Coordination under Floating Exchange Rates We have replaced the detailed two-country model of earlier editions with a brief intuitive discussion of the major results on international policy repercussions. That change allows the instructor to focus more on important policy issues and less on dry technical details. Chapter 20, Optimum Currency Areas and the European Experience As recently as the mid-1990s, Europe's vision of a single currency looked like a distant and possibly unreachable goal. As of 2002, however, twelve European countries had replaced their national currencies with the euro, and others are poised to follow. Chapter 20 has been revised to cover the first years of experience with the euro. Chapter 21,The Global Capital Market: Performance and Policy Problems To make room for more topical material elsewhere in the book, we have streamlined this chapter by removing the detailed exposition of Eurocurrency creation contained in earlier editions.

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Preface In addition to these structural changes, we have updated the book in other ways to maintain current relevance. Thus we extend our coverage of the welfare effect of newly industrializing countries' exports on more advanced economies (Chapter 5); we update the discussion of Japanese policy toward the semiconductor industry (Chapter 11); we discuss Japan's liquidity trap (Chapter 17) and evidence on the effect of currency unions on trade volume (Chapter 20); and we recount the collapse of Argentina's currency in 2002 (Chapter 22).

Learning Features This book incorporates a number of special learning features that will maintain students' interest in the presentation and help them master its lessons. Case Studies Theoretical discussions are often accompanied by case studies that perform the threefold role of reinforcing material covered earlier, illustrating its applicability in the real world, and providing important historical information. Special Boxes Less central topics that nonetheless offer particularly vivid illustrations of points made in the text are treated in boxes. Among these are the political backdrops of Ricardo's and Hume's theories (pp. 59 and 540); the surprising potential importance of NAFTA's effect on California's demand for water (p. 227); the astonishing ability of disputes over banana trade to generate acrimony among countries far too cold to grow any of their own bananas (p. 245); the story of the Bolivian hyperinflation (p. 380); and the 1994 speculative attack on the Mexican peso (p. 506). Captioned Diagrams More than 200 diagrams are accompanied by descriptive captions that reinforce the discussion in the text and help the student in reviewing the material. Summary and Key Terms Each chapter closes with a summary recapitulating the major points. Key terms and phrases appear in boldface type when they are introduced in the chapter and are listed at the end of each chapter. To further aid student review of the material, key terms are italicized when they appear in the chapter summary. Problems Each chapter is followed by problems intended to test and solidify students' comprehension. The problems range from routine computational drills to "big picture" questions suitable for classroom discussion. In many problems we ask students to apply what they have learned to real-world data or policy questions. Further Reading For instructors who prefer to supplement the textbook with outside readings, and for students who wish to probe more deeply on their own, each chapter has an annotated bibliography that includes established classics as well as up-to-date examinations of recent issues.

Preface

Study Guide, Instructor's Manual, and Web Site International Economics: Theory and Policy is accompanied by a Study Guide written by Linda S. Goldberg of the Federal Reserve Bank of New York, Michael W. Klein of Tufts University, and Jay C. Shambaugh of Dartmouth College. The Study Guide aids students by providing a review of central concepts from the text, further illustrative examples, and additional practice problems. An Instructor's Manual, also by Linda S. Goldberg, Michael W. Klein, and Jay C. Shambaugh, includes chapter overviews, answers to the end-of-chapter problems, and suggestions for classroom presentation of the book's contents. The Study Guide and Instructor's Manual have been updated to reflect the changes in the sixth edition. We are also pleased to recommend the companion Web site to accompany International Economics, Sixth Edition, at www.aw.com/krugman_obstfeld. The site offers students self-check quizzes for each chapter, links to sites of interest, and occasional updates on latebreaking developments. All new to the site for this edition is an animated PowerPoint program of the text's figures and tables, prepared by Iordanis Petsas of the University of Florida under the direction of Professor Elias Dinopoulos. And also featured on the Web site is a brand-new, comprehensive Test Bank for the instructor, prepared by Yochanan Shachmurove of the City College of the City University of New York and the University of Pennsylvania, and Mitchell H. Kellman of the City College of the City University of New York and the Graduate Center of the City University of New York. The Test Bank offers a rich array of multiple-choice and essay questions, plus mathematical and graphical problems, for each textbook chapter. For those interested in course management, a Course Compass Web site is also available. Contact your Addison-Wesley sales representative for details.

Acknowledgments Our primary debts are to Jane E. Tufts, the development editor, and to Sylvia Mallory and Denise Clinton, the economics editors in charge of the project. Jane's judgment and skill have been reflected in all six editions of this book; we cannot thank her enough for her contributions. Heather Johnson's efforts as project editor are greatly appreciated. We thank the other editors who helped make the first five editions as good as they were. We owe a debt of gratitude to Galina Hale, who painstakingly updated data, checked proofs, and critiqued chapters. Annie Wai-Kuen Shun provided sterling assistance. For constructive suggestions we thank Syed M. Ahsan, Daniel Borer, Petra Geraats, Alan M. Taylor, Hans Visser, and Mickey Wu. We thank the following reviewers for their recommendations and insights: Michael Arghyrou, Brunei University, U.K. Debajyoti Chakrabarty, Rutgers University Adhip Chaudhuri, Georgetown University Barbara Craig, Oberlin College Robert Driskill, Vanderbilt University Hugh Kelley, Indiana University Michael Kevane, Santa Clara University

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Preface Shannon Mudd, Thunderbird American Graduate School of International Management Steen Nielsen, Copenhagen Business School Nina Pavcnik, Dartmouth College Iordanis Petsas, University of Florida Very helpful comments on earlier editions were received from the following reviewers: Jaleel Ahmad, Concordia University Myrvin Anthony, University of Strathclyde, U.K. Richard Ault, Auburn University George H. Borts, Brown University Francisco Carrada-Bravo, American Graduate School of International Management Jay Pil Choi, Michigan State University Brian Copeland, University of British Columbia Ann Davis, Marist College Gopal C. Dorai, William Paterson University Gerald Epstein, University of Massachusetts at Amherst Jo Anne Feeney, University of Colorado, Boulder Robert Foster, American Graduate School of International Management Diana Fuguitt, Eckerd College Byron Gangnes, University of Hawaii at Manoa Ranjeeta Ghiara, California State University, San Marcos Neil Gilfedder, Stanford University Patrick Gormely, Kansas State University Bodil Olai Hansen, Copenhagen Business School Henk Jager, University of Amsterdam Arvind Jaggi, Franklin & Marshall College Mark Jelavich, Northwest Missouri State University Patrice Franko Jones, Colby College Philip R. Jones, University of Bath and University of Bristol, UK, Maureen Kilkenny, Pennsylvania State University Faik Koray, Louisiana State University Corinne Krupp, Duke University Bun Song Lee, University of Nebraska, Omaha Francis A. Lees, St. Johns University Rodney D. Ludema, The University of Western Ontario Marcel Merette, Yale University Shannon Mitchell, Virginia Commonwealth University Kaz Miyagiwa, University of Washington Ton M. Mulder, Erasmus University, Rotterdam E. Wayne Nafziger, Kansas State University Terutomo Ozawa, Colorado State University Arvind Panagariya, University of Maryland

Preface

Donald Schilling, University of Missouri, Columbia Ronald M. Schramm, Columbia University Craig Schulman, University of Arkansas Yochanan Shachmurove, University of Pennsylvania Margaret Simpson, The College of William and Mary Robert M. Stern, University of Michigan Rebecca Taylor, University of Portsmouth, U.K. Scott Taylor, University of British Columbia Aileen Thompson, Carleton University Sarah Tinkler, Weber State University Arja H. Turunen-Red, University of Texas, Austin Dick vander Wai, Free University of Amsterdam Although we have not been able to make each and every suggested change, we found reviewers' observations invaluable in revising the book. Obviously, we bear sole responsibility for its remaining shortcomings. Paul R. Krugman Maurice Obstfeld

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I

Introduction

Y

ou could say that the study of international trade and finance is where the discipline of economics as we know it began. Historians of economic thought often describe the essay "Of the balance of trade" by the Scottish philosopher David Hume as the first real exposition of an economic model. Hume published his essay in 1758, almost 20 years before his friend Adam Smith published The Wealth of Nations. And the debates over British trade policy in the early nineteenth century did much to convert economics from a discursive, informal field to the model-oriented subject it has been ever since. Yet the study of international economics has never been as important as it is now. A t the beginning of the twenty-first century, nations are more closely linked through trade in goods and services, through flows of money, through investment in each other's economies than ever before. And the global economy created by these linkages is a turbulent place: both policymakers and business leaders in every country, including the United States, must now take account of what are sometimes rapidly changing economic fortunes halfway around the world. A look at some basic trade statistics gives us a sense of the unprecedented importance of international economic relations. Figure I -1 shows the levels of U.S. exports and imports as shares of gross domestic product from 1959 to 2000. The most obvious feature of the figure is the sharp upward trend in both shares: international trade has roughly tripled in importance compared with the economy as a whole. Almost as obvious is that while both exports and imports have increased, in the late 1990s imports grew much faster, leading to a large excess of imports over exports. How was the United States able to pay for all those imported goods? The answer is that the money was supplied by large inflows of capital, money invested by foreigners eager to buy a piece of the booming U.S. economy. Inflows of capital on that scale would once have been inconceivable; now they are taken for granted. And so the gap between imports and exports is an indicator of another aspect of growing international linkages, in this case the growing linkages between national capital markets. If international economic relations have become crucial t o the United States, they are even more crucial to other nations. Figure 1-2 shows the shares of imports and exports in GDP for a sample of countries. The United States, by virtue of its size and the diversity of its resources, relies less on international trade than almost any other country.

CHAPTER I

Introduction

igure 1-1 Exports and Imports as a Percentage of U.S. National Income Exports, imports (percent of U.S. national income) 14 13 12 11 10 Exports

9 8 7 6 5 4

T I T l I I TV 1960 1965

I I I I I i i i i i i ii I I I I I I I I ! I I I I I I I II 1 9 9 0 1 9 9 5 2000 1970 1975 1 9 8 01 9 8 5

From the 1960s t o 1980, both exports and imports rose steadily as shares of U.S. income. Since 1980, exports have fluctuated sharply.

M

Figure 1-2 I Exports and Imports as Percentages of National Income in 1994 Exports, imports (percent of national income)

International trade is even more important to most other countries than it is to the

70 —|

United States.

60 -

Source: Statistical Abstract of the United States

50 40 -

in

30 -

1

20 10 u I

Ml U.S.

Help France Exports

H

Canada 1

Belgium

1 Imports

CHAPTER I

Introduction

Consequently, for the rest of the world, international economics is even more important than it is for the United States. This book introduces the main concepts and methods of international economics and illustrates them with applications drawn from the real world. Much of the book is devoted to old ideas that are still as valid as ever: the nineteenth-century trade theory of David Ricardo and even the eighteenth-century monetary analysis of David Hume remain highly relevant to the twenty-first-century world economy. At the same time, we have made a special effort to bring the analysis up to date.The global economy of the 1990s threw up many new challenges, from the backlash against globalization to an unprecedented series of financial crises. Economists were able to apply existing analyses to some of these challenges, but they were also forced to rethink some important concepts. Furthermore, new approaches have emerged to old questions, such as the impacts of changes in monetary and fiscal policy. We have attempted to convey the key ideas that have emerged in recent research while stressing the continuing usefulness of old ideas. • r

hat Is International Economics About?

International economics uses the same fundamental methods of analysis as other branches of economics, because the motives and behavior of individuals are the same in international trade as they are in domestic transactions. Gourmet food shops in Florida sell coffee beans from both Mexico and Hawaii; the sequence of events that brought those beans to the shop is not very different, and the imported beans traveled a much shorter distance! Yet international economics involves new and different concerns, because international trade and investment occur between independent nations. The United States and Mexico are sovereign states; Florida and Hawaii are not. Mexico's coffee shipments to Florida could be disrupted if the U.S. government imposed a quota that limits imports; Mexican coffee could suddenly become cheaper to U.S. buyers if the peso were to fall in value against the dollar. Neither of those events can happen in commerce within the United States because the Constitution forbids restraints on interstate trade and all U.S. states use the same currency. The subject matter of international economics, then, consists of issues raised by the special problems of economic interaction between sovereign states. Seven themes recur throughout the study of international economics: the gains from trade, the pattern of trade, protectionism, the balance of payments, exchange rate determination, international policy coordination, and the international capital market.

The Gains From Trade Everybody knows that some international trade is beneficial—nobody thinks that Norway should grow its own oranges. Many people are skeptical, however, about the benefits of trading for goods that a country could produce for itself. Shouldn't Americans buy American goods whenever possible, to help create jobs in the United States? Probably the most important single insight in all of international economics is that there are gains from trade—that is, when countries sell goods and services to each other, this exchange is almost always to their mutual benefit. The range of circumstances under which international trade is beneficial is much wider than most people imagine. It is a common misconception that trade is harmful if there are large disparities between countries in productivity or wages. On one side, businessmen in less technologically advanced countries,

CHAPTER I

Introduction

such as India, often worry that opening their economies to international trade will lead to disaster because their industries won't be able to compete. On the other side, people in technologically advanced nations where workers earn high wages often fear that trading with less advanced, lower-wage countries will drag their standard of living down—one presidential candidate memorably warned of a "giant sucking sound" if the United States were to conclude a free-trade agreement with Mexico. Yet the first model of trade in this book (Chapter 2) demonstrates that two countries can trade to their mutual benefit even when one of them is more efficient than the other at producing everything, and when producers in the less efficient country can compete only by paying lower wages. We'll also see that trade provides benefits by allowing countries to export goods whose production makes relatively heavy use of resources that are locally abundant while importing goods whose production makes heavy use of resources that are locally scarce (Chapter 4). International trade also allows countries to specialize in producing narrower ranges of goods, giving them greater efficiencies of large-scale production. Nor are the benefits of international trade limited to trade in tangible goods. International migration and international borrowing and lending are also forms of mutually beneficial trade—the first a trade of labor for goods and services, the second a trade of current goods for the promise of future goods (Chapter 7). Finally, international exchanges of risky assets such as stocks and bonds can benefit all countries by allowing each country to diversify its wealth and reduce the variability of its income (Chapter 21). These invisible forms of trade yield gains as real as the trade that puts fresh fruit from Latin America in Toronto markets in February. While nations generally gain from international trade, however, it is quite possible that international trade may hurt particular groups within nations—in other words, that international trade will have strong effects on the distribution of income. The effects of trade on income distribution have long been a concern of international trade theorists, who have pointed out that: International trade can adversely affect the owners of resources that are "specific" to industries that compete with imports, that is, cannot find alternative employment in other industries (Chapter 3). Trade can also alter the distribution of income between broad groups, such as workers and the owners of capital (Chapter 4). These concerns have moved from the classroom into the center of real-world policy debate, as it has become increasingly clear that the real wages of less-skilled workers in the United States have been declining even though the country as a whole is continuing to grow richer. Many commentators attribute this development to growing international trade, especially the rapidly growing exports of manufactured goods from low-wage countries. Assessing this claim has become an important task for international economists and is a major theme of both Chapters 4 and 5. The Pattern of Trade Economists cannot discuss the effects of international trade or recommend changes in government policies toward trade with any confidence unless they know their theory is good enough to explain the international trade that is actually observed. Thus attempts to explain

CHAPTER I

Introduction

the pattern of international trade—who sells what to whom—have been a major preoccupation of international economists. Some aspects of the pattern of trade are easy to understand. Climate and resources clearly explain why Brazil exports coffee and Saudi Arabia exports oil. Much of the pattern of trade is more subtle, however. Why does Japan export automobiles, while the United States exports aircraft? In the early nineteenth century English economist David Ricardo offered an explanation of trade in terms of international differences in labor productivity, an explanation that remains a powerful insight (Chapter 2). In the twentieth century, however, alternative explanations have also been proposed. One of the most influential, but still controversial, links trade patterns to an interaction between the relative supplies of national resources such as capital, labor, and land on one side and the relative use of these factors in the production of different goods on the other. We present this theory in Chapter 4. Recent efforts to test the implications of this theory, however, appear to show that it is less valid than many had previously thought. More recently still, some international economists have proposed theories that suggest a substantial random component in the pattern of international trade, theories that are developed in Chapter 6. How Much Trade? If the idea of gains from trade is the most important theoretical concept in international economics, the seemingly eternal debate over how much trade to allow is its most important policy theme. Since the emergence of modern nation-states in the sixteenth century, governments have worried about the effect of international competition on the prosperity of domestic industries and have tried either to shield industries from foreign competition by placing limits on imports or to help them in world competition by subsidizing exports. The single most consistent mission of international economics has been to analyze the effects of these so-called protectionist policies—and usually, though not always, to criticize protectionism and show the advantages of freer international trade. The debate over how much trade to allow took a new direction in the 1990s. Since World War II the advanced democracies, led by the United States, have pursued a broad policy of removing barriers to international trade; this policy reflected the view that free trade was a force not only for prosperity but also for promoting world peace. In the first half of the 1990s several major free-trade agreements were negotiated. The most notable were the North American Free Trade Agreement (NAFTA) between the United States, Canada, and Mexico, approved in 1993, and the so-called Uruguay Round agreement establishing the World Trade Organization in 1994. Since then, however, an international political movement opposing "globalization" has gained many adherents. The movement achieved notoriety in 1999, when demonstrators representing a mix of traditional protectionists and new ideologies disrupted a major international trade meeting in Seattle. If nothing else, the anti-globalization movement has forced advocates of free trade to seek new ways to explain their views. As befits both the historical importance and the current relevance of the protectionist issue, roughly a quarter of this book is devoted to this subject. Over the years, international economists have developed a simple yet powerful analytical framework for determining the effects of government policies that affect international trade. This framework not only predicts the effects of trade policies, it also allows cost-benefit analysis and defines criteria for determining when government intervention is good for the economy. We present this

CHAPTER I

Introduction

framework in Chapters 8 and 9 and use it to discuss a number of policy issues in those chapters and in the following two. In the real world, however, governments do not necessarily do what the cost-benefit analysis of economists tells them they should. This does not mean that analysis is useless. Economic analysis can help make sense of the politics of international trade policy, by showing who benefits and who loses from such government actions as quotas on imports and subsidies to exports. The key insight of this analysis is that conflicts of interest within nations are usually more important in determining trade policy than conflicts of interest between nations. Chapters 3 and 4 show that trade usually has very strong effects on income distribution within countries, while Chapters 9, 10, and 11 reveal that the relative power of different interest groups within countries, rather than some measure of overall national interest, is often the main determining factor in government policies toward international trade. Balance of Payments In 1998 both China and South Korea ran large trade surpluses of about $40 billion each. In China's case the trade surplus was not out of the ordinary—the country had been running large surpluses for several years, prompting complaints from other countries, including the United States, that China was not playing by the rules. So is it good to run a trade surplus, and bad to run a trade deficit? Not according to the South Koreans: their trade surplus was forced on them by an economic and financial crisis, and they bitterly resented the necessity of running that surplus. This comparison highlights the fact that a country's balance of payments must be placed in the context of an economic analysis to understand what it means. It emerges in a variety of specific contexts: in discussing international capital movements (Chapter 7), in relating international transactions to national income accounting (Chapter 12), and in discussing virtually every aspect of international monetary policy (Chapters 16 through 22). Like the problem of protectionism, the balance of payments has become a central issue for the United States because the nation has run huge trade deficits in every year since 1982. Exchange Rate Determination The euro, a new common currency for most of the nations of western Europe, was introduced on January 1, 1999. On that day the euro was worth about $1.17. Almost immediately, however, the euro began to slide, and in early 2002 it was worth only about $0.85. This slide was a major embarrassment to European politicians, though many economists argued that the sliding euro had actually been beneficial to the European economy—and that the strong dollar had become a problem for the United States. A key difference between international economics and other areas of economics is that countries usually have their own currencies. And as the example of the euro-dollar exchange rate illustrates, the relative values of currencies can change over time, sometimes drastically. The study of exchange rate determination is a relatively new part of international economics, for historical reasons. For most of the twentieth century, exchange rates have been fixed by government action rather than determined in the marketplace. Before World War I the values of the world's major currencies were fixed in terms of gold, while for a generation after World War II the values of most currencies were fixed in terms of the U.S. dollar. The analysis of international monetary systems that fix exchange rates remains an important subject. Chapters 17 and 18 are devoted to the working of fixed-rate systems, Chapter 19 to

CHAPTER I

Introduction

the debate over which system, fixed or floating rates, is better, and Chapter 20 to the economics of currency areas such as the European monetary union. For the time being, however, some of the world's most important exchange rates fluctuate minute by minute and the role of changing exchange rates remains at the center of the international economics story. Chapters 13 through 16 focus on the modern theory of floating exchange rates. International Policy Coordination The international economy comprises sovereign nations, each free to choose its own economic policies. Unfortunately, in an integrated world economy one country's economic policies usually affect other countries as well. For example, when Germany's Bundesbank raised interest rates in 1990—a step it took to control the possible inflationary impact of the reunification of West and East Germany—it helped precipitate a recession in the rest of Western Europe. Differences in goals between countries often lead to conflicts of interest. Even when countries have similar goals, they may suffer losses if they fail to coordinate their policies. A fundamental problem in international economics is how to produce an acceptable degree of harmony among the international trade and monetary policies of different countries without a world government that tells countries what to do. For the last 45 years international trade policies have been governed by an international treaty known as the General Agreement on Tariffs and Trade (GATT), and massive international negotiations involving dozens of countries at a time have been held. We discuss the rationale for this system in Chapter 9 and look at whether the current rules of the game for international trade in the world economy can or should survive. While cooperation on international trade policies is a well-established tradition, coordination of international macroeconomic policies is a newer and more uncertain topic. Only in the last few years have economists formulated at all precisely the case for macroeconomic policy coordination. Nonetheless, attempts at international macroeconomic coordination are occurring with growing frequency in the real world. Both the theory of international macroedonomic coordination and the developing experience are reviewed in Chapters 18 and 19. The International Capital Market During the 1970s, banks in advanced countries lent large sums to firms and governments in poorer nations, especially in Latin America. In 1982, however, this era of easy credit came to a sudden end when Mexico, then a number of other countries, found themselves unable to pay the money they owed. The resulting "debt crisis" persisted until 1990. In the 1990s investors once again became willing to put hundreds of billions of dollars into "emerging markets," both in Latin America and in the rapidly growing economies of Asia. All too soon, however, this investment boom too came to grief; Mexico experienced another financial crisis at the end of 1994, and much of Asia was caught up in a massive crisis beginning in the summer of 1997. This roller coaster history contains many lessons, the most undisputed of which is the growing importance of the international capital market. In any sophisticated economy there is an extensive capital market: a set of arrangements by which individuals and firms exchange money now for promises to pay in the future. The growing importance of international trade since the 1960s has been accompanied by a growth in the international capital market, which links the capital markets of individual countries. Thus in the 1970s oil-rich Middle Eastern nations placed their oil

8

CHAPTER!

Introduction

revenues in banks in London or New York, and these banks in turn lent money to governments and corporations in Asia and Latin America. During the 1980s Japan converted much of the money it earned from its booming exports into investments in the United States, including the establishment of a growing number of U.S. subsidiaries of Japanese corporations. International capital markets differ in important ways from domestic capital markets. They must cope with special regulations that many countries impose on foreign investment; they also sometimes offer opportunities to evade regulations placed on domestic markets. Since the 1960s, huge international capital markets have arisen, most notably the remarkable London Eurodollar market, in which billions of dollars are exchanged each day without ever touching the United States. Some special risks are associated with international capital markets. One risk is that of currency fluctuations: If the euro falls against the dollar, U.S. investors who bought euro bonds suffer a capital loss—as the many investors who had assumed that Europe's new currency would be strong discovered to their horror. Another risk is that of national default: A nation may simply refuse to pay its debts (perhaps because it cannot), and there may be no effective way for its creditors to bring it to court. The growing importance of international capital markets and their new problems demand greater attention than ever before. This book devotes two chapters to issues arising from international capital markets: one on the functioning of global asset markets (Chapter 21) and one on foreign borrowing by developing countries (Chapter 22).

Hpternational Economics: Trade and Money The economics of the international economy can be divided into two broad subfields: the study of international trade and the study of international money. International trade analysis focuses primarily on the real transactions in the international economy, that is, on those transactions that involve a physical movement of goods or a tangible commitment of economic resources. International monetary analysis focuses on the monetary side of the international economy, that is, on financial transactions such as foreign purchases of U.S. dollars. An example of an international trade issue is the conflict between the United States and Europe over Europe's subsidized exports of agricultural products; an example of an international monetary issue is the dispute over whether the foreign exchange value of the dollar should be allowed to float freely or be stabilized by government action. In the real world there is no simple dividing line between trade and monetary issues. Most international trade involves monetary transactions, while, as the examples in this chapter already suggest, many monetary events have important consequences for trade. Nonetheless, the distinction between international trade and international money is useful. The first half of this book covers international trade issues. Part One (Chapters 2 through 7) develops the analytical theory of international trade, and Part Two (Chapters 8 through 11) applies trade theory to the analysis of government policies toward trade. The second half of the book is devoted to international monetary issues. Part Three (Chapters 12 through 17) develops international monetary theory, and Part Four (Chapters 18 through 22) applies this analysis to international monetary policy.

PART

International Trade Theory

C H A P T E R

2
atc^atw rJOtn Home and Foreign will specialize in cheese production. There will be no wine production, so that the relative supply of cheese will become infinite. The relative demand curve RD does not require such exhaustive analysis. The downward slope of RD reflects substitution effects. As the relative price of cheese rises, consumers will tend to purchase less cheese and more wine, so the relative demand for cheese falls. The equilibrium relative price of cheese is determined by the intersection of the relative supply and relative demand curves. Figure 2-3 shows a relative demand curve RD that intersects the RS curve at point 1, where the relative price of cheese is between the two countries' pretrade prices. In this case each country specializes in the production of the good in which it has a comparative advantage: Home produces only cheese, Foreign only wine.

CHAPTER 2

Labor Productivity and Comparative Advantage

This is not, however, the only possible outcome. If the relevant RD curve were RD', for example, relative supply and relative demand would intersect on one of the horizontal sections of RS. At point 2 the world relative price of cheese after trade is aLC/a/w, the same as the opportunity cost of cheese in terms of wine in Home. What is the significance of this outcome? If the relative price of cheese is equal to its opportunity cost in Home, the Home economy need not specialize in producing either cheese or wine. In fact, at point 2 Home must be producing both some wine and some cheese; we can infer this from the fact that the relative supply of cheese (point Q' on horizontal axis) is less than it would be if Home were in fact completely specialized. Since Pc/Pw is below the opportunity cost of cheese in terms of wine in Foreign, however, Foreign does specialize completely in producing wine. It therefore remains true that if a country does specialize, it will do so in the good in which it has a comparative advantage. Let us for the moment leave aside the possibility that one of the two countries does not completely specialize. Except in this case, the normal result of trade is that the price of a traded good (e.g., cheese) relative to that of another good (wine) ends up somewhere in between its pretrade levels in the two countries. The effect of this convergence in relative prices is that each country specializes in the production of that good in which it has the relatively lower unit labor requirement. The rise in the relative price of cheese in Home will lead Home to specialize in the production of cheese, producing at point F in Figure 2-4a. The fall in the relative price of cheese in Foreign will lead Foreign to specialize in the production of wine, producing at point F* in Figure 2-4b.

The Gains From Trade We have now seen that countries whose relative labor productivities differ across industries will specialize in the production of different goods. We next show that both countries derive gains from trade from this specialization. This mutual gain can be demonstrated in two alternative ways. The first way to show that specialization and trade are beneficial is to think of trade as an indirect method of production. Home could produce wine directly, but trade with Foreign allows it to "produce" wine by producing cheese and then trading the cheese for wine. This indirect method of "producing" a gallon of wine is a more efficient method than direct production. Consider two alternative ways of using an hour of labor. On one side, Home could use the hour directly to produce \laLV/ gallons of wine. Alternatively, Home could use the hour to produce \laLC pounds of cheese. This cheese could then be traded for wine, with each pound trading for Pc/Pw gallons, so our original hour of labor yields (\/alc) (Pc/Pw) gallons of wine. This will be more wine than the hour could have produced directly as long as (\iaLC)(PcIPw)>

\laLW>

(2-5)

or Pc/Pw >

aLC/aLW.

But we just saw that in international equilibrium, if neither country produces both goods, we must have Pc/Pw > aLC/aLW. This shows that Home can "produce" wine more efficiently by making cheese and trading it than by producing wine directly for itself. Similarly,

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M

International Trade Theory i

'

"•"."•'

"

Figure 2-4 I Trade Expands Consumption Possibilities

Quantity of wine, Qw

Quantity of wine,

F*

Quantity of cheese, Qc (a) Home

Quantity of cheese, (b) Foreign

International trade allows Home and Foreign to consume anywhere within the colored lines, which lie outside the countries' production possibility frontiers.

Foreign can "produce" cheese more efficiently by making wine and trading it. This is one way of seeing that both countries gain. Another way to see the mutual gains from trade is to examine how trade affects each country's possibilities for consumption. In the absence of trade, consumption possibilities are the same as production possibilities (the solid lines P F and P*F* in Figure 2-4). Once trade is allowed, however, each economy can consume a different mix of cheese and wine from the mix it produces. Home's consumption possibilities are indicated by the colored line TF in Figure 2-4a, while Foreign's consumption possibilities are indicated by T*F* in Figure 2-4b. In each case trade has enlarged the range of choice, and therefore it must make residents of each country better off.

A Numerical Example In this section, we use a numerical example to solidify our understanding of two crucial points: When two countries specialize in producing the goods in which they have a comparative advantage, both countries gain from trade. Comparative advantage must not be confused with absolute advantage; it is comparative, not absolute, advantage that determines who will and should produce a good. Suppose, then, that Home and Foreign have the unit labor requirements illustrated in Table 2-2.

CHAPTER 2 Table 2-2

Home Foreign

Labor Productivity and Comparative Advantage

Unit Labor Requirements

Cheese

Wine

aLC = 1 hour per pound afc = 6 hours per pound

aLW — 2 hours per gallon a*w = 3 hours per gallon

A striking feature of this table is that Home has lower unit labor requirements, that is, has higher labor productivity, in both industries. Let us leave this observation for a moment, however, and focus on the pattern of trade. The first thing we need to do is determine the relative price of cheese Pc/Pw- While the actual relative price depends on demand, we know that it must lie between the opportunity cost of cheese in the two countries. In Home, we have aLC = 1, a[W = 2; so the opportunity cost of cheese in terms of wine in Home is aLCfaLW = 1/2. In Foreign, afc = 6, a^w = 3; so the opportunity cost of cheese is 2. In world equilibrium, the relative price of cheese must lie between these values. In our example we assume that in world equilibrium a pound of cheese trades for a gallon of wine on world markets so that PCIPW — 1 • If a pound of cheese sells for the same price as a gallon of wine, both countries will specialize. It takes only half as many person-hours in Home to produce a pound of cheese as it takes to produce a gallon of wine (1 versus 2); so Home workers can earn more by producing cheese, and Home will specialize in cheese production. Conversely, it takes twice as many Foreign person-hours to produce a pound of cheese as it takes to produce a gallon of wine (6 versus 3), so Foreign workers can earn more by producing wine, and Foreign will specialize in wine production. Let us confirm that this pattern of specialization produces gains from trade. First, we want to show that Home can "produce" wine more efficiently by making cheese and trading it for wine than by direct production. In direct production, an hour of Home labor produces only Vi gallon of wine. The same hour could be used to produce 1 pound of cheese, which can then be traded for 1 gallon of wine. Clearly, Home does gain from trade. Similarly, Foreign could use 1 hour of labor to produce[A pound of cheese; if, however, it uses the hour to produce 'A gallon of wine it could then trade the A gallon of wine for XA pound of cheese. This is twice as much as the % pound of cheese it gets using the hour to produce the cheese directly. In this example, each country can use labor twice as efficiently to trade for what it needs instead of producing its imports for itself.

Relative Wages Political discussions of international trade often focus on comparisons of wage rates in different countries. For example, opponents of trade between the United States and Mexico often emphasize the point that workers in Mexico are paid only about $2 per hour, compared with more than $15 per hour for the typical worker in the United States. Our discussion of international trade up to this point has not explicitly compared wages in the two countries, but it is possible in the context of this numerical example to determine how the wage rates in the two countries compare. In this example, once the countries have specialized, all Home workers are employed producing cheese. Since it takes 1 hour of labor to produce 1 pound of cheese, workers in

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THE LOSSES FROM NON-TRADE Our discussion of the gains from trade was considered a "thought experiment" in which we compared two situations: one in which countries do not trade at all, another in which they have free trade. It's a hypothetical case that helps us to understand the principles of international economics, but it doesn't have much to do with actual events. After all, countries don't suddenly go from no trade to free trade or vice versa. Or do they? As the economic historian Douglas Irwin* has pointed out, in the early history of the United States the country actually did carry out something very close to the thought experiment of moving from free trade to no trade. The historical context was as follows: at the time Britain and France were engaged in a massive military struggle, the Napoleonic Wars. Both countries endeavored to bring economic pressures to bear: France tried to keep European countries from trading with Britain, while Britain imposed a blockade on France. The young United States was neutral in the conflict but suffered considerably. In particular, the British navy often seized U.S. merchant ships, and on occasion forcibly recruited their crews into its service. In an effort to pressure Britain into ceasing these practices, President Thomas Jefferson declared a complete ban on overseas shipping. This embargo

would deprive both the United States and Britain of the gains from trade, but Jefferson hoped that Britain would be hurt more and would agree to stop its depredations. Irwin presents evidence suggesting that the embargo was quite effective: although some smuggling took place, trade between the United States and the rest of the world was drastically reduced. In effect, the United States gave up international trade for a while. The costs were substantial. Although quite a lot of guesswork is involved, Irwin suggests that real income in the United States may have fallen by about 8 percent as a result of the embargo. When you bear in mind that in the early nineteenth century only a fraction of output could be traded— transport costs were still too high, for example, to allow large-scale shipments of commodities like wheat across the Atlantic—that's a pretty substantial sum. Unfortunately for Jefferson's plan, Britain did not seem to feel equal pain and showed no inclination to give in to U.S. demands. Fourteen months after the embargo was imposed, it was repealed. Britain continued its practices of seizing American cargoes and sailors; three years later the two countries went to war.

*Douglas Irwin, "The Welfare Cost of Autarky: Evidence from the Jeffersonian Trade Embargo, 1807-1809," National Bureau of Economic Research Working Paper no. 8692, Dec. 2001.

Home earn the value of 1 pound of cheese per hour of their labor. Similarly, Foreign workers produce only wine; since it takes 3 hours for them to produce each gallon, they earn the value of 'A of a gallon of wine per hour. To convert these numbers into dollar figures, we need to know the prices of cheese and wine. Suppose that a pound of cheese and a gallon of wine both sell for $12; then Home workers will earn $ 12 per hour, while Foreign workers will earn $4 per hour. The relative wage of a country's workers is the amount they are paid per hour, compared with the amount workers in another country are paid per hour. The relative wage of Home workers will therefore be 3. Clearly, this relative wage does not depend on whether the price of a pound of cheese is $ 12 or $20, as long as a gallon of wine sells for the same price. As long as the relative price of cheese—the price of a pound of cheese divided by the price of a gallon of wine—is 1, the wage of Home workers will be three times that of Foreign workers.

CHAPTER 2

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Notice that this wage rate lies between the ratios of the two countries' productivities in the two industries. Home is six times as productive as Foreign in cheese, but only one-anda-half times as productive in wine, and it ends up with a wage rate three times as high as Foreign's. It is precisely because the relative wage is between the relative productivities that each country ends up with a cost advantage in one good. Because of its lower wage rate, Foreign has a cost advantage in wine, even though it has lower productivity. Home has a cost advantage in cheese, despite its higher wage rate, because the higher wage is more than offset by its higher productivity. We have now developed the simplest of all models of international trade. Even though the Ricardian one-factor model is far too simple to be a complete analysis of either the causes or the effects of international trade, a focus on relative labor productivities can be a very useful tool for thinking about international trade. In particular, the simple one-factor model is a good way to deal with several common misconceptions about the meaning of comparative advantage and the nature of the gains from free trade. These misconceptions appear so frequently in public debate about international economic policy, and even in statements by those who regard themselves as experts, that in the next section we take time out to discuss some of the most common misunderstandings about comparative advantage in light of our model.

sconceptions About Comparative Advantage There is no shortage of muddled ideas in economics. Politicians, business leaders, and even economists frequently make statements that do not stand up to careful economic analysis. For some reason this seems to be especially true in international economics. Open the business section of any Sunday newspaper or weekly news magazine and you will probably find at least one article that makes foolish statements about international trade. Three misconceptions in particular have proved highly persistent, and our simple model of comparative advantage can be used to see why they are incorrect. Productivity and Competitiveness Myth 1: Free trade is beneficial only if your country is strong enough to stand up to foreign competition. This argument seems extremely plausible to many people. For example, a well-known historian recently criticized the case for free trade by asserting that it may fail to hold in reality: "What if there is nothing you can produce more cheaply or efficiently than anywhere else, except by constantly cutting labor costs?" he worried.2 The problem with this commentator's view is that he failed to understand the essential point of Ricardo's model, that gains from trade depend on comparative rather than absolute advantage. He is concerned that your country may turn out not to have anything it produces more efficiently than anyone else—that is, that you may not have an absolute advantage in anything. Yet why is that such a terrible thing? In our simple numerical example of trade, Home has lower unit labor requirements and hence higher productivity in both the cheese and wine sectors. Yet, as we saw, both countries gain from trade.

2

Paul Kennedy, "The Threat of Modernization." New Perspectives Quarterly (Winter 1995), pp. 31-33.

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Tt is always tempting to suppose that the ability to export a good depends on your country having an absolute advantage in productivity. But an absolute productivity advantage over other countries in producing a good is neither a necessary nor a sufficient condition for having a comparative advantage in that good. In our one-factor model the reason why absolute productivity advantage in an industry is neither necessary nor sufficient to yield competitive advantage is clear: The competitive advantage of an industry depends not only on its productivity relative to the foreign industry, but also on the domestic wage rate relative to the foreign wage rate. A country's wage rate, in turn, depends on relative productivity in its other industries. In our numerical example, Foreign is less efficient than Home in the manufacture of wine, but at even a greater relative productivity disadvantage in cheese. Because of its overall lower productivity, Foreign must pay lower wages than Home, sufficiently lower that it ends up with lower costs in wine production. Similarly, in the real world, Portugal has low productivity in producing, say, clothing as compared with the United States, but because Portugal's productivity disadvantage is even greater in other industries it pays low enough wages to have a comparative advantage in clothing all the same. But isn't a competitive advantage based on low wages somehow unfair? Many people think so; their beliefs are summarized by our second misconception.

The Pauper Labor Argument Myth 2: Foreign competition is unfair and hurts other countries when it is based on low wages. This argument, sometimes referred to as the pauper labor argument, is a particular favorite of labor unions seeking protection from foreign competition. People who adhere to this belief argue that industries should not have to cope with foreign industries that are less efficient but pay lower wages. This view is widespread and has acquired considerable political influence. In 1993 Ross Perot, a self-made billionaire and former presidential candidate, warned that free trade between the United States and Mexico, with its much lower wages, would lead to a "giant sucking sound" as U.S. industry moved south. In the same year Sir James Goldsmith, another self-made billionaire who was an influential member of the European Parliament, offered similar if less picturesquely expressed views in his book The Trap, which became a best-seller in France. Again, our simple example reveals the fallacy of this argument. In the example, Home is more productive than Foreign in both industries, and Foreign's lower cost of wine production is entirely due to its much lower wage rate. Foreign's lower wage rate is, however, irrelevant to the question of whether Home gains from trade. Whether the lower cost of wine produced in Foreign is due to high productivity or low wages does not matter. All that matters to Home is that it is cheaper in terms of its own labor for Home to produce cheese and trade it for wine than to produce wine for itself. This is fine for Home, but what about Foreign? Isn't there something wrong with basing one's exports on low wages? Certainly it is not an attractive position to be in, but the idea that trade is good only if you receive high wages is our final fallacy.

Exploitation Myth 3: Trade exploits a country and makes it worse off if its workers receive much lower wages than workers in other nations. This argument is often expressed in emotional terms. For example, one columnist contrasted the $2 million income of the chief executive officer of the clothing chain The Gap with the $0.56 per hour paid to the Central

CHAPTER 2

Labor Productivity and Comparative Advantage

25

DO WAGES REFLECT PRODUCTIVITY? In the numerical example that we use to puncture common misconceptions about comparative advantage, we assume that the relative wage of the two countries reflects their relative productivity—specifically, that the ratio of Home to Foreign wages is in a range that gives each country a cost advantage in one of the two goods. This is a necessary implication of our theoretical model. But many people are unconvinced by that model. In particular, rapid increases in productivity in "emerging" economies like China have worried some Western observers, who argue that these countries will continue to pay low wages even as their productivity increases—putting high-wage countries at a cost disadvantage—and dismiss the contrary predictions of orthodox economists as unrealistic theoretical speculation. Leaving aside the logic of this position, what is the evidence? As it happens, growth in the "newly industrializing economies" of Asia provides a clear test. The so-called Asian tigers—South Korea, Taiwan, Hong Kong, and Singapore—began a rapid process of development in the 1960s and achieved much higher rates of productivity growth than Western nations through the last few decades of the twentieth century. For example, output per

T a b l e 2-3

1

United States South Korea Taiwan Hong Kong Singapore

worker in South Korea was only 20 percent of the U.S. level in 1975; it had risen to more than half the U.S. level by 1998. Did wages stay low during this productivity surge, or did wages in the newly industrializing economies rise along with their productivity? The answer, illustrated in Table 2-3, is that wages rose. The first two columns show compensation (wages plus benefits) as a percent of the U.S. level in 1975 and 1999; clearly there was a dramatic convergence of wages toward the U.S. level. Did Asian relative wages rise more or less than their relative productivity? The U.S. Bureau of Labor Statistics has calculated rates of change in unit labor costs for South Korea and Taiwan, though not for the other Asian economies. If wage growth lagged behind productivity, unit labor costs would fall compared with the United States; if wage growth exceeded productivity, relative unit labor costs would rise. In fact, as the third column of the table shows, South Korea's unit labor costs lagged slightly behind those in the United States, while Taiwan's grew more rapidly. In short, the evidence strongly supports the view, based on economic models, that productivity increases are reflected in wage increases.

Changes in Wages and Unit Labor Costs

Compensation per Hour, 1975 (US = 100)

Compensation per Hour, 2000 (US = 100)

Annual Rate of Increase in Unit Labor Costs, 1979-2000

100 5 6 12 13

100 41 30 28 37

1.1 0.7 3.6 NA NA

Source: Bureau of Labor Statistics (foreign labor statistics home page, www.bls.gov/fls/home.htm)

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American workers who produce some of its merchandise.3 It can seem hard-hearted to try to justify the terrifyingly low wages paid to many of the world's workers. If one is asking about the desirability of free trade, however, the point is not to ask whether low-wage workers deserve to be paid more but to ask whether they and their country are worse off exporting goods based on low wages than they would be if they refused to enter into such demeaning trade. And in asking this question one must also ask, what is the alternative? Abstract though it is, our numerical example makes the point that one cannot declare that a low wage represents exploitation unless one knows what the alternative is. In that example, Foreign workers are paid much less than Home workers, and one could easily imagine a columnist writing angrily about their exploitation. Yet if Foreign refused to let itself be "exploited" by refusing to trade with Home (or by insisting on much higher wages in its export sector, which would have the same effect), real wages would be even lower: The purchasing power of a worker's hourly wage would fall from 'A to % pound of cheese. The columnist who pointed out the contrast in incomes between the executive at TJie Gap and the workers who make its clothes was angry at the poverty of Central American workers. But to deny them the opportunity to export and trade might well be to condemn them to even deeper poverty.

omparative Advantage with Many Goods In our discussion so far we have relied on a model in which only two goods are produced and consumed. This simplified analysis allows us to capture many essential points about comparative advantage and trade and, as we saw in the last section, gives us a surprising amount of mileage as a tool for discussing policy issues. To move closer to reality, however, it is necessary to understand how comparative advantage functions in a model with a larger number of goods.

Setting Up the Model Again, imagine a world of two countries, Home and Foreign. As before, each country has only one factor of production, labor. Each of these countries will now, however, be assumed to consume and to be able to produce a large number of goods—say, N different goods altogether. We assign each of the goods a number from 1 to N; The technology of each country can be described by its unit labor requirement for each good, that is, the number of hours of labor it takes to produce one unit of each. We label Home's unit labor requirement for a particular good as au, where i is the number we have assigned to that good. If cheese is now good number 7, aL1 will mean the unit labor requirement in cheese production. Following our usual rule, we label the corresponding Foreign unit labor requirements a*r To analyze trade, we next pull one more trick. For any good we can calculate ciu/a*r the ratio of Home's unit labor requirement to Foreign's. The trick is to relabel the goods so that

3

Bob Herbert, "Sweatshop Beneficiaries: How to Get Rich on 56 Cents an Hour" New York Times (July 24, 1995), p. A13.

CHAPTER 2

Labor Productivity and Comparative Advantage

the lower the number, the lower this ratio. That is, we reshuffle the order in which we number goods in such a way that U

L\IUL\

U

L2/UL2

^

U

LyULl

-

' '

U

LNIU LN'

K

'

Relative Wages and Specialization We are now prepared to look at the pattern of trade. This pattern depends on only one thing: the ratio of Home to Foreign wages. Once we know this ratio, we can determine who produces what. Let w be the wage rate per hour in Home and w* be the wage rate in Foreign. The ratio of wage rates is then w/w*. The rule for allocating world production, then, is simply this: Goods will always be produced where it is cheapest to make them. The cost of making some good, say good i, is the unit labor requirement times the wage rate. To produce good i in Home will cost waLi. To produce the same good in Foreign will cost w*a*Li. It will be cheaper to produce the good in Home if ...

waLi<w*a*Li,

which can be rearranged to yield

a*ulau > w/w*. On the other hand, it will be cheaper to produce the good in Foreign if waLi>w*a*Li, which can be rearranged to yield a*Li/aLj < w/w*. Thus we can restate the allocation rule: Any good for which afilaLi > w/w* will be produced in Home, while any good for which afj/aLi < w/w* will be produced in Foreign. We have already lined up the goods in increasing order of a[j/afj (equation (2-6)). This criterion for specialization tells us that what happens is a "cut" in that lineup, determined by the ratio of the two countries' wage rates, w/w*. All the goods to the left of the cut end up being produced in Home; all the goods to the right end up being produced in Foreign. (It is possible, as we will see in a moment, that the ratio of wage rates is exactly equal to the ratio of unit labor requirements for one good. In that case this borderline good may be produced in both countries.) Table 2-4 offers a numerical example in which Home and Foreign both consume and are able to produce five goods: apples, bananas, caviar, dates, and enchiladas. The first two columns of this table are self-explanatory. The third column is the ratio of the Foreign unit labor requirement to the Home unit labor requirement for each good—or, stated differently, the relative Home productivity advantage in each good. We have labeled the goods in order of Home productivity advantage, with the Home advantage greatest for apples and least for enchiladas.

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International Trade Theory

T a b l e 2-4

Good

Apples Bananas Caviar Dates Enchiladas

Home and Foreign Unit Labor Requirements

Home Unit Labor Requirement (aLl)

Foreign Unit Labor Requirement (a|,)

Relative Home Productivity Advantage (a|./aLl.)

1 5 3 6 12

10 40 12 12 9

10 8 4 2 0.75

Which country produces which goods depends on the ratio of Home and Foreign wage rates. Home will have a cost advantage in any good for which its relative productivity is higher than its relative wage, and Foreign will have the advantage in the others. If, for example, the Home wage rate is five times that of Foreign (a ratio of Home wage to Foreign wage of five to one), apples and bananas will be produced in Home and caviar, dates, and enchiladas in Foreign. If the Home wage rate is only three times that of Foreign, Home will produce apples, bananas, and caviar, while Foreign will produce only dates and enchiladas. Is such a pattern of specialization beneficial to both countries? We can see that it is by using the same method we used earlier: comparing the labor cost of producing a good directly in a country with that of indirectly "producing" it by producing another good and trading for the desired good. If the Home wage rate is three times the Foreign wage (put another way, Foreign's wage rate is one-third that of Home), Home will import dates and enchiladas. A unit of dates requires 12 units of Foreign labor to produce, but its cost in terms of Home labor, given the three-to-one wage ratio, is only 4 person-hours (12 -=- 3). This cost of 4 person-hours is less than the 6 person-hours it would take to produce the unit of dates in Home. For enchiladas, Foreign actually has higher productivity along with lower wages; it will cost Home only 3 person-hours to acquire a unit of enchiladas through trade, compared with the 12 person-hours it would take to produce it domestically. A similar calculation will show that Foreign also gains; for each of the goods Foreign imports it turns out to be cheaper in terms of domestic labor to trade for the good rather than produce the good domestically. For example, it would take 10 hours of Foreign labor to produce a unit of apples; even with a wage rate only one-third that of Home workers, it will require only 3 hours of labor to earn enough to buy that unit of apples from Home. In making these calculations, however, we have simply assumed that the relative wage rate is 3. How does this relative wage rate actually get determined? Determining the Relative Wage in the Multigood Model In the two-good model we determined relative wages by first calculating Home wages in terms of cheese and Foreign wages in terms of wine, then using the price of cheese relative to that of wine to deduce the ratio of the two countries' wage rates. We could do this because we knew that Home would produce cheese and Foreign wine. In the many-good case, who produces what can be determined only after we know the relative wage rate, so this procedure is unworkable. To determine relative wages in a multigood economy we must

CHAPTER 2

Labor Productivity and Comparative Advantage

look behind the relative demand for goods to the implied relative demand for labor. This is not a direct demand on the part of consumers; rather, it is a derived demand that results from the demand for goods produced with each country's labor. The relative derived demand for Home labor will fall when the ratio of Home to Foreign wages rises, for two reasons. First, as Home labor becomes more expensive relative to Foreign labor, goods produced in Home also become relatively more expensive, and world demand for these goods falls. Second, as Home wages rise, fewer goods will be produced in Home and more in Foreign, further reducing the demand for Home labor. We can illustrate these two effects using our numerical example. Suppose we start with the following situation: The Home wage is initially 3.5 times the Foreign wage. At that level, Home would produce apples, bananas, and caviar while Foreign would produce dates and enchiladas. If the relative Home wage were to increase from 3.5 to just under 4, say 3.99, the pattern of specialization would not change, but as the goods produced in Home became relatively more expensive, the relative demand for these goods would decline and the relative demand for Home labor would decline with it. Suppose now that the relative wage were to increase slightly from 3.99 to 4.01. This small further increase in the relative Home wage would bring about a shift in the pattern of specialization. Because it is now cheaper to produce caviar in Foreign than in Home, the production of caviar shifts from Home to Foreign. What does this imply for the relative demand for Home labor? Clearly it implies that as the relative wage rises from a little less than 4 to a little more than 4 there is an abrupt drop-off in the relative demand, as Home production of caviar falls to zero and Foreign acquires a new industry. If the relative wage continues to rise, relative demand for Home labor will gradually decline, then drop off abruptly at a relative wage of 8, at which wage production of bananas shifts to Foreign. We can illustrate the determination of relative wages with a diagram like Figure 2-5. Unlike Figure 2-3, this diagram does not have relative quantities of goods or relative prices of goods on its axes. Instead it shows the relative quantity of labor and the relative wage rate. The world demand for Home labor relative to its demand for Foreign labor is shown by the curve RD. The world supply of Home labor relative to Foreign labor is shown by the line RS. The relative supply of labor is determined by the relative size of Home and Foreign labor forces. Assuming that the number of person-hours available does not vary with the wage, the relative wage has no effect on relative labor supply and RS is a vertical line. Our discussion of the relative demand for labor explains the "stepped" shape of RD. Whenever we increase the wage rate of Home workers relative to Foreign workers, the relative demand for goods produced in Home will decline and the demand for Home labor will decline with it. In addition, the relative demand for Home labor will drop off abruptly whenever an increase in the relative Home wage makes a good cheaper to produce in Foreign. So the curve alternates between smoothly downward sloping sections where the pattern of specialization does not change and "flats" where the relative demand shifts abruptly because of shifts in the pattern of specialization. As shown in the figure, these "flats" correspond to relative wages that equal the ratio of Home to Foreign productivity for each of the five goods. The equilibrium relative wage is determined by the intersection of RD and RS. As drawn, the equilibrium relative wage is 3. At this wage, Home produces apples, bananas, and caviar while Foreign produces dates and enchiladas. The outcome depends on the relative size of the countries (which determines the position of RS) and the relative demand for the goods (which determines the shape and position of RD).

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j f l | Figure 2-5 Determination of Relative Wages In a many-good Ricardian model, relative wages are determined

Relative wage rate, w/w*

s

by the intersection of the derived relative demand curve for labor RD with the relative

Apples 10-

supply RS. Q O

—

\ \

Bananas

\ Caviar 4-

*

32- : : : : 0.75-

\ Dates sEnchiladas -^ RD Relative quantity of labor, LA*

If the intersection of RD and RS happens to lie on one of the flats, both countries produce the good to which the flat applies.

Adding Transport Costs and Nontraded Goods We now extend our model another step closer to reality by considering the effects of transport costs. Transportation costs do not change the fundamental principles of comparative advantage or the gains from trade. Because transport costs pose obstacles to the movement of goods and services, however, they have important implications for the way a trading world economy is affected by a variety of factors such as foreign aid, international investment, and balance of payments problems. While we will not deal with the effects of these factors yet, the multigood one-factor model is a good place to introduce the effects of transport costs. First, notice that the world economy described by the model of the last section is marked by very extreme international specialization. At most there is one good that both countries produce; all other goods are produced either in Home or in Foreign, not in both. There are three main reasons why specialization in the real international economy is not this extreme: 1. The existence of more than one factor of production reduces the tendency toward specialization (as we see in the next two chapters).

CHAPTER 2

Labor Productivity and Comparative Advantage

2. Countries sometimes protect industries from foreign competition (discussed at length in Chapters 8 through 11). 3. It is costly to transport goods and services, and in some cases the cost of transportation is enough to lead countries into self-sufficiency in certain sectors. In the multigood example of the last section we found that at a relative Home wage of 3, Home could produce apples, bananas, and caviar more cheaply than Foreign, while Foreign could produce dates and enchiladas more cheaply than Home. In the absence of transport costs, then, Home will export the first three goods and import the last two. Now suppose there is a cost to transporting goods, and that this transport cost is a uniform fraction of production cost, say 100 percent. This transportation cost will discourage trade. Consider, for example, dates. One unit of this good requires 6 hours of Home labor or 12 hours of Foreign labor to produce. At a relative wage of 3, 12 hours of Foreign labor cost only as much as 4 hours of Home labor; so in the absence of transport costs Home imports dates. With a 100 percent transport cost, however, importing dates would cost the equivalent of 8 hours of Home labor, so Home will produce the good for itself instead. A similar cost comparison shows that Foreign will find it cheaper to produce its own caviar than import it. A unit of caviar requires 3 hours of Home labor to produce. Even at a relative Home wage of 3, which makes this the equivalent of 9 hours of Foreign labor, this is cheaper than the 12 hours Foreign would need to produce caviar for itself. In the absence of transport costs, then, Foreign would find it cheaper to import caviar than to make it domestically. With a 100 percent cost of transportation, however, imported caviar would cost the equivalent of 18 hours of Foreign labor and would therefore be produced locally instead. The result of introducing transport costs in this example, then, is that while Home still exports apples and bananas and imports enchiladas, caviar and dates become nontraded goods, which each country produces for itself. In this example we have assumed that transport costs are the same fraction of production cost in all sectors. In practice there is a wide range of transportation costs. In some cases transportation is virtually impossible: Services such as haircuts and auto repair cannot be traded internationally (except where there is a metropolitan area that straddles a border, like Detroit, Michigan-Windsor, Ontario). There is also little international trade in goods with high weight-to-value ratios, like cement. (It is simply not worth the transport cost of importing cement, even if it can be produced much more cheaply abrdad). Many goods end up being nontraded either because of the absence of strong national cost advantages or because of high transportation costs. The important point is that nations spend a large share of their income on nontraded goods. This observation is of surprising importance in our later discussion of international transfers of income (Chapter 5) and in international monetary economics.

Iptnpirical Evidence on the Ricardian Model The Ricardian model of international trade is an extremely useful tool for thinking about the reasons why trade may happen and about the effects of international trade on national welfare. But is the model a good fit to the real world? Does the Ricardian model make accurate predictions about actual international trade flows?

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The answer is a heavily qualified yes. Clearly there are a number of ways in which the Ricardian model makes misleading predictions. First, as mentioned in our discussion of nontraded goods, the simple Ricardian model predicts an extreme degree of specialization that we do not observe in the real world. Second, the Ricardian model assumes away effects of international trade on the distribution of income within countries, and thus predicts that countries as a whole will always gain from trade; in practice, international trade has strong effects on income distribution, which is the focus of Chapter 3. Third, the Ricardian model allows no role for differences in resources among countries as a cause of trade, thus missing an important aspect of the trading system (the focus of Chapter 4). Finally, the Ricardian model neglects the possible role of economies of scale as a cause of trade, which leaves it unable to explain the large trade flows between apparently similar nations^an issue discussed in Chapter 6. In spite of these failings, however, the basic prediction of the Ricardian model—that countries should tend to export those goods in which their productivity is relatively h i g h has been strongly confirmed by a number of studies over the years. Several classic tests of the Ricardian model were performed using data from the early post-World War II period comparing British with American productivity and trade.4 This was an unusually illuminating comparison. British labor productivity was less than American in almost every sector. Thus America had an absolute advantage in everything. Nonetheless, the amount of British overall exports was about as large as American at the time. Clearly then, there must have been some sectors in which Britain had a comparative advantage in spite of its lower absolute productivity. The Ricardian model would predict that these would be the sectors in which America's productivity advantage was smallest. Figure 2-6 illustrates the evidence in favor of the Ricardian model, using data presented in a paper by the Hungarian economist Bela Balassa in 1963. The figure compares the ratio of U.S. to British exports in 1951 with the ratio of U.S. to British labor productivity for 26 manufacturing industries. The productivity ratio is measured on the horizontal axis, the export ratio on the vertical axis. Both axes are given a logarithmic scale; this is not of any basic importance, but turns out to produce a clearer picture. Ricardian theory would lead us broadly to expect that the higher the relative productivity in the U.S. industry, the more likely U.S. rather than U.K. firms would export in that industry. And that is what Figure 2-6 shows. In fact, the scatterplot lies quite close to an upward-sloping line, also shown in the figure. Bearing in mind that the data used for this comparison are, like all economic data, subject to substantial measurement errors, the fit is remarkably close. As expected, the evidence in Figure 2-6 confirms the basic insight that trade depends on comparative, not absolute advantage. At the time to which the data refer, U.S. industry had much higher labor productivity than British industry—on average about twice as high. The commonly held misconception that a country can be competitive only if it can match other countries' productivity, which we discussed earlier in this chapter, would have led one

4

The pioneering study by G. D. A. MacDougall is listed in Further Reading at the end of the chapter. A well-known follow-up study, on which we draw here, was Bela Balassa, "An Empirical Demonstration of Classical Comparative Cost Theory," Review of Economics and Statistics 4, August 1963, pp. 231-238; we use Balassa's numbers as an illustration.

CHAPTER 2

Figure 2-6

Labor Productivity and Comparative Advantage

Productivity and Exports

A comparative study showed that U.S. exports were high relative to British exports in industries in which the

Ratio of U.S./British exports

United States had high relative labor productivity. Each dot represents a different industry.

2-

1 .5 .25 .1251

\ .5

T 2

\ i

r r 4

8

Ratio of U.S./British productivity

to predict a U.S. export advantage across the board. The Ricardian model tells us, however, that having high productivity in an industry compared with foreigners is not enough to ensure that a country will export that industry's products; the relative productivity must be high compared with relative productivity in other sectors. As it happens, U.S. productivity exceeded British in all 26 sectors (indicated by dots) shown in Figure 2-6, by margins ranging from 11 to 366 percent. In 12 of the sectors, however, Britain actually had larger exports than the United States. A glance at the Figure shows that in general, U.S. exports were larger than U.K. exports only in industries where the U.S. productivity advantage was somewhat more than two to one. More recent evidence on the Ricardian model has been less clear-cut. In part, this is because the growth of world trade and the resulting specialization of national economies means that we do not get a chance to see what countries do badly! In the world economy of the 1990s, countries often do not produce goods for which they are at a comparative disadvantage, so there is no way to measure their productivity in those sectors. For example, most countries do not produce airplanes, so there are no data on what their unit labor requirements would be if they did. Nonetheless, there are several pieces of evidence suggesting that differences in labor productivity continue to play an important role in determining world trade patterns. Perhaps the most important point is that there continue to be both large differences in labor productivity between countries and considerable variation in those productivity differences across industries. For example, one study found that the average productivity of labor in Japanese manufacturing in 1990 was 20 percent lower than labor productivity in the United States. But in the automobile and auto parts industries Japanese productivity

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was 16 to 24 percent higher than American productivity.5 It is not hard to believe that this disparity explained much of Japan's ability to export millions of automobiles to the United States. In the case of automobiles, one might argue that the pattern of trade simply reflected absolute advantage: Japan had the highest productivity and was also the world's largest exporter. The principle of comparative advantage may be illustrated by the case of world trade in clothing. By any measure, advanced countries like the United States have higher labor productivity in the manufacture of clothing than newly industrializing countries like Mexico or China. But because the technology of clothing manufacture is relatively simple, the productivity advantage of advanced nations in the clothing industry is less than their advantage in many other industries. For example, in 1992 the average U.S. manufacturing worker was probably about five times as productive as the average Mexican worker; but in the clothing industry the productivity advantage was only about 50 percent. The result is that clothing is a major export from low-wage to high-wage nations. In sum, while few economists believe that the Ricardian model is a fully adequate description of the causes and consequences of world trade, its two principal implications— that productivity differences play an important role in international trade and that'it is comparative rather than absolute advantage that matters—do seem to be supported by the evidence.

Summary 1. We examined the Ricardian model, the simplest model that shows how differences between countries give rise to trade and gains from trade. In this model labor is the only factor of production and countries differ only in the productivity of labor in different industries. 2. In the Ricardian model, countries will export goods that their labor produces relatively efficiently and import goods that their labor produces relatively inefficiently. In other words, a country's production pattern is determined by comparative advantage. 3. That trade benefits a country can be shown in either of two ways. First, we can think of trade as an indirect method of production. Instead of producing a good for itself, a country can produce another good and trade it for the desired good. The simple model shows that whenever a good is imported it must be true that this indirect "production" requires less labor than direct production. Second, we can show that trade enlarges a country's consumption possibilities, implying gains from trade. 4. The distribution of the gains from trade depends on the relative prices of the goods countries produce. To determine these relative prices it is necessary to look at the relative world supply and demand for goods. The relative price implies a relative wage rate as well.

s

McKinsey Global Institute, Manufacturing Productivity, Washington, D.C., 1993.

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5. The proposition that trade is beneficial is unqualified. That is, there is no requirement that a country be "competitive" or that the trade be "fair." In particular, we can show that three commonly held beliefs about trade are wrong. First, a country gains from trade even if it has lower productivity than its trading partner in all industries. Second, trade is beneficial even if foreign industries are competitive only because of low wages. Third, trade is beneficial even if a country's exports embody more labor than its imports. 6. Extending the one-factor, two-good model to a world of many commodities does not alter these conclusions. The only difference is that it becomes necessary to focus directly on the relative demand for labor to determine relative wages rather than to work via relative demand for goods. Also, a many-commodity model can be used to illustrate the important point that transportation costs can give rise to a situation in which some nontraded goods exist. 7. While some of the predictions of the Ricardian model are clearly unrealistic, its basic prediction—that countries will tend to export goods in which they have relatively high productivity—has been confirmed by a number of studies.

Key Terms absolute advantage, p. 15 comparative advantage, p. 12 derived demand, p. 29 gains from trade, p. 19 general equilibrium analysis, p. 17 nontraded goods, p. 31 opportunity cost, p. 11 partial equilibrium analysis, p. 16

pauper labor argument, p. 24 production possibility frontier, p. 12, 13 relative demand curve, p. 17 relative supply curve, p. 17 relative wage, p. 22 Ricardian model, p. 12 unit labor requirement, p. 12

Problems 1. Home has 1200 units of labor available. It can produce two goods, apples and bananas. The unit labor requirement in apple production is 3, while in banana production it is 2. a. Graph Home's production possibility frontier. b. What is the opportunity cost of apples in terms of bananas? c. In the absence of trade, what would the price of apples in terms of bananas be? Why? 2. Home is as described in problem 1. There is now also another country, Foreign, with a labor force of 800. Foreign's unit labor requirement in apple production is 5, while in banana production it is 1. a. Graph Foreign's production possibility frontier. b. Construct the world relative supply curve. 3. Now suppose world relative demand takes the following form: Demand for apples/ demand for bananas = price of bananas/price of apples a. Graph the relative demand curve along with the relative supply curve.

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4.

5.

6.

7.

8.

9. 10.

International Trade Theory

b. What is the equilibrium relative price of apples? c. Describe the pattern of trade. d. Show that both Home and Foreign gain from trade. Suppose that instead of 1200 workers, Home had 2400. Find the equilibrium relative price. What can you say about the efficiency of world production and the division of the gains from trade between Home and Foreign in this case? Suppose that Home has 2400 workers, but they are only half as productive in both industries as we have been assuming. Construct the world relative supply curve and determine the equilibrium relative price. How do the gains from trade compare with those in the case described in problem 4? "Korean workers earn only $2.50 an hour; if we allow Korea to export as much as it likes to the United States, our workers will be forced down to the same level. You can't import a $5 shirt without importing the $2.50 wage that goes with it." Discuss. Japanese labor productivity is roughly the same as that of the United States in the manufacturing sector (higher in some industries, lower in others), while the United States is still considerably more productive in the service sector. But most services are nontraded. Some analysts have argued that this poses a problem for the United States, because our comparative advantage lies in things we cannot sell on world markets. What is wrong with this argument? Anyone who has visited Japan knows it is an incredibly expensive place; although Japanese workers earn about the same as their U.S. counterparts, the purchasing power of their incomes is about one-third less. Extend your discussion from question 7 to explain this observation. (Hint: Think about wages and the implied prices of nontraded goods.) How does the fact that many goods are nontraded affect the extent of possible gains from trade? We have focused on the case of trade involving only two countries. Suppose that there are many countries capable of producing two goods, and that each country has only one factor of production, labor. What could we say about the pattern of production and trade in this case? (Hint: Try constructing the world relative supply curve.)

Further Reading Donald Davis. "Intraindustry Trade: A Heckscher-Ohlin-Ricardo Approach." Journal of International Economics 39 (November 1995), pp. 201-226. A recent revival of the Ricardian approach to explain trade between countries with similar resources. Rudiger Dornbusch, Stanley Fischer, and Paul Samuelson. "Comparative Advantage, Trade and Payments in a Ricardian Model with a Continuum of Goods." American Economic Review 67 (December 1977), pp. 823-839. More recent theoretical modeling in the Ricardian mode, developing the idea of simplifying the many-good Ricardian model by assuming that the number of goods is so large as to form a smooth continuum. Giovanni Dosi, Keith Pavitt, and Luc Soete. The Economics of Technical Change and International Trade. Brighton: Wheatsheaf, 1988. An empirical examination that suggests that international trade in manufactured goods is largely driven by differences in national technological competences. G. D. A. MacDougall. "British and American Exports: A Study Suggested by the Theory of Comparative Costs." Economic Journal 61 (December 1951), pp. 697-724; 62 (September 1952),

CHAPTER 2

Labor Productivity and Comparative Advantage

pp. 487-521. In this famous study, MacDougall used comparative data on U.S. and U.K. productivity to test the predictions of the Ricardian model. John Stuart Mill. Principles of Political Economy. London: Longmans, Green, 1917. Mill's 1848 treatise extended Ricardo's work into a full-fledged model of international trade. David Ricardo. The Principles of Political Economy and Taxation. Homewood, IL: Irwin, 1963. The basic source for the Ricardian model is Ricardo himself in this book, first published in 1817.

37

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3

Specific Factors and Income Distribution

A

s we saw in Chapter 2, international trade can be mutually beneficial to the nations k engaged in it. Yet throughout history, governments have protected sectors of the economy from import competition. For example, despite its commitment in principle to free trade, the United States limits imports of textiles, sugar, and other commodities. If trade is such a good thing for the economy, why is there opposition to its effects? To understand the politics of trade, it is necessary to look at the effects of trade, not just on a country as a whole but on the distribution of income within that country. The Ricardian model of international trade developed in Chapter 2 illustrates the potential benefits from trade. In that model trade leads to international specialization, with each country shifting its labor force from industries in which that labor is relatively inefficient to industries in which it is relatively more efficient. Because labor is the only factor of production in the model, and it is assumed to be able to move freely from one industry to another, there is no possibility that individuals will be hurt by trade. The Ricardian model thus suggests not only that all countries gain from trade, but that every individual is made better off as a result of international trade, because trade does not affect the distribution of income. In the real world, however, trade has substantial effects on the income distribution within each trading nation, so that in practice the benefits of trade are often distributed very unevenly. There are two main reasons why international trade has strong effects on the distribution of income. First, resources cannot move immediately or costlessly from one industry to another. Second, industries differ in the factors of production they demand: A shift in the mix of goods that a country produces will ordinarily reduce the demand for some factors of production, while raising the demand for others. For both of these reasons, international trade is not as unambiguously beneficial as it appeared to be in Chapter 2. While trade may benefit a nation as a whole, it often hurts significant groups within the country, at least in the short run. Consider the effects of Japan's rice policy. Japan allows very little rice to be imported, even though the scarcity of land means that rice is much more expensive to produce in Japan than in other countries (including the United States). There is little question that Japan as a whole would have a higher standard of living if free imports of rice were allowed. Japanese rice farmers, however, would be hurt by free trade. While the farmers

38

CHAPTER 3

Specific Factors and Income Distribution

displaced by imports could probably find jobs in manufacturing or services in Japan's full employment economy, they would find changing employment costly and inconvenient. Furthermore, the value of the land that the farmers own would fall along with the price of rice. Not surprisingly, Japanese rice farmers are vehemently opposed to free trade in rice, and their organized political opposition has counted for more than the potential gains from trade for the nation as a whole. A realistic analysis of trade must go beyond the Ricardian model to models in which trade can affect income distribution. This chapter concentrates on a particular model, known as the specific factors model, that brings income distribution into the story in a particularly clear way. •

he Specific Factors Model The specific factors model was developed by Paul Samuelson and Ronald Jones.1 Like the simple Ricardian model, it assumes an economy that produces two goods and that can allocate its labor supply between the two sectors. Unlike the Ricardian model, however, the specific factors model allows for the existence of factors of production besides labor. Whereas labor is a mobile factor that can move between sectors, these other factors are assumed to be specific. That is, they can be used only in the production of particular goods. Assumptions of the Model Imagine an economy that can produce two goods, manufactures and food. Instead of one factor of production, however, the country has three: labor (L), capital (K), and land (T for terrain). Manufactures are produced using capital and labor (but not land), while food is produced using land and labor (but not capital). Labor is therefore a mobile factor that can be used in either sector, while land and capital are both specific factors that can be used only in the production of one good. How much of each good does the economy produce? The economy's output of manufactures depends on how much capital and labor are used in that sector. This relationship is summarized by a production function that tells us the quantity of manufactures that can be produced given any input of capital and labor. The production function for manufactures can be summarized algebraically as QM=QM(K,LM),

(3-1)

where QM is the economy's output of manufactures, K is the economy's capital stock, and LM is the labor force employed in manufactures. Similarly, for food we can write the production function QF = QF(T,LF),

!

(3-2)

Paul Samuelson, "Ohlin Was Right," Swedish Journal of Economics 73 (1971), pp. 365-384: and Ronald W. Jones, "A Three-Factor Model in Theory, Trade, and History," in Jagdish Bhagwati et al., eds., Trade, Balance of Payments, and Growth (Amsterdam: North-Holland, 1971), pp. 3-21.

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1

WHAT IS A SPECIFIC FACTOR? In the model developed in this chapter, we assume that there are two factors of production, land and capital, which are permanently tied to particular sectors of the economy. In advanced economies, however, agricultural land receives only a small part of national income. When economists apply the specific factors model to economies like that of the United States or France, they typically think of factor specificity not as a permanent condition but as a matter of time. For example, the vats used to brew beer and the stamping presses used to build auto bodies cannot be substituted for each other, and so these different kinds of equipment are industry-specific. Given time, however, it is possible to redirect investment from auto factories to breweries or vice versa, and so in a long-term sense both vats and stamping presses can be considered to be two manifestations of a single, mobile factor called capital. In practice, then, the distinction between specific and mobile factors is not a sharp line. It is a

question of the speed of adjustment, with factors more specific the longer it takes to redeploy them between industries. So how specific are the factors of production in the real economy? Workers who have fairly general skills, as opposed to highly specific training, seem to be quite mobile, if not quite as mobile as labor in the model. One useful clue comes from the time it takes labor to move between geographic locations. One influential study finds that when a U.S. state hits economic difficulties, workers quickly begin leaving for other states; within six years the unemployment rate falls back to the national average.* This compares with a lifetime of 15 or 20 years for a typical specialized machine, and perhaps 50 years for a shopping mall or office building. So labor is certainly a less specific factor than most kinds of capital. On the other hand, highly trained workers are pretty much stuck with their craft: A brain surgeon might have made a pretty good violinist, but she cannot switch careers in mid-life.

^Olivier Blanchard and Lawrence Katz, "Regional Evolutions," Brookings Papers on Economic Activity, 1991.

where QF is the economy's output of food, T is the economy's supply of land, and LF is the labor force devoted to food production. For the economy as a whole, the labor employed must equal the total labor supply L: = L.

(3-3)

Production Possibilities The specific factors model assumes that each of the specific factors capital and land can be used in only one sector, manufactures and food, respectively. Only labor can be used in either sector. Thus to analyze the economy's production possibilities, we need only to ask how the economy's mix of output changes as labor is shifted from one sector to the other. This can be done graphically, first by representing the production functions (3-1) and (3-2), then by putting them together to derive the production possibility frontier. Figure 3-1 illustrates the relationship between labor input and output of manufactures. The larger the input of labor, for a given capital supply, the larger will be output. In Figure 3-1, the slope of QM{K,LM) represents the marginal product of labor, that is, the addition to output generated by adding one more person-hour. However, if labor input is

CHAPTER 3

Specific Factors and Income Distribution

figure 3-1 The Production Function for Manufactures The more labor that is employed in the

Output, Q,M

production of manufactures, the larger the output. As a result of diminishing returns, however, each successive person-hour increases output by less than the previous one; this is shown by the fact that the curve relating labor input to output gets flatter at higher levels of employment.

Labor input, LM

increased without increasing capital as well, there will normally be diminishing returns: Because adding a worker means that each worker has less capital to work with, each successive increment of labor will add less to production than the last. Diminishing returns are reflected in the shape of the production function: QM(K,LM) gets flatter as we move to the right, indicating that the marginal product of labor declines as more labor is used. Figure 3-2 shows the same information a different way. In this figure we directly plot the marginal product of labor as a function of the labor employed. (In the appendix to this chapter we show that the area under the marginal product curve represents the total output of manufactures.) A similar pair of diagrams can represent the production function for food. These diagrams can then be combined to derive the production possibility frontier for the economy, as illustrated in Figure 3-3. As we saw in Chapter 2, the production possibility frontier shows what the economy is capable of producing; in this case it shows how much food it can produce for any given output of manufactures and vice versa. Figure 3-3 is a four-quadrant diagram. In the lower right quadrant we show the production function for manufactures illustrated in Figure 3-1. This time, however, we turn the figure on its side: A movement downward along the vertical axis represents an increase in the labor input to the manufactures sector, while a movement to the right along the horizontal axis represents an increase in the output of manufactures. In the upper left quadrant we show the corresponding production function for food; this part of the figure is also flipped around, so that a movement to the left along the horizontal axis indicates an increase in labor input to the food sector, while an upward movement along the vertical axis indicates an increase in food output. The lower left quadrant represents the economy's allocation of labor. Both quantities are measured in the reverse of the usual direction. A downward movement along the vertical axis indicates an increase in the labor employed in manufactures; a leftward movement

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Figure 3-2 j The Marginal Product of Labor The marginal product of labor in the manufactures sector, equal to the slope

Marginal product of labor, MPLM

of the production function shown in Figure 3-1, is lower the more labor the sector employs.

MPL•M

Labor input, LM

along the horizontal axis indicates an increase in labor employed in food. Since an increase in employment in one sector must mean that less labor is available for the other, the possible allocations are indicated by a downward sloping line. This line, labeled A A, slopes downward at a 45-degree angle, that is, it has a slope of — 1. To see why this line represents the possible labor allocations, notice that if all labor were employed in food production, LF would equal L, while LM would equal 0. If one were then to move labor gradually into the manufacturing sector, each person-hour moved would increase LM by one unit while reducing LF by one unit, tracing a line with a slope of — 1, until all the entire labor supply L was employed in manufactures. Any particular allocation of labor between the two sectors can then be represented by a point on A A, such as point 2. We can now see how to determine production given any particular allocation of labor between the two sectors. Suppose that the allocation of labor were represented by point 2 in the lower left quadrant, that is, with L^ hours in manufacturing and LF hours in food. Then we can use the production function for each sector to determine output: Q2M units are produced in manufacturing, Qj in food. Using these coordinates Q2M, Qj, point 2' in the upper right quadrant of Figure 3-3 shows the resulting output of manufactures and food. To trace the whole production possibility frontier, we simply imagine repeating this exercise for many alternative allocations of labor. We might start with most of the labor allocated to food production, as at point 1 in the lower left quadrant, then gradually increase the amount of labor used in manufactures until very few workers are employed in food, as at point 3; the corresponding points in the upper right quadrant will trace out the curve running from 1' to 3'. Thus PP in the upper right quadrant shows the economy's production possibilities for given supplies of land, labor, and capital. In the Ricardian model, where labor is the only factor of production, the production possibility frontier is a straight line because the opportunity cost of manufactures in terms of

CHAPTER 3

Specific Factors and Income Distribution

43

gure 3-3 The Production Possibility Frontier in the Specific Factors Model

Production function for food

Output of food, Q F (increasing?)

Economy's production possibility frontier (PP)

QF= QF(Tr LF)

.

Labor input in food, LF (increasing slope

\

slope = —^

-{w/rf

\

A V \\ v 2

ZC&

-cc

Labor input

C H A P T E R

5

The Standard Trade Model

P

revious chapters developed three different models of international trade, each of which makes different assumptions about the determinants of production possibilities. To bring out important points, each of these models leaves out aspects of reality that the others stress. These models are: • The Ricardian model. Production possibilities are determined by the allocation of a single resource, labor, between sectors.This model conveys the essential idea of comparative advantage but does not allow us to talk about the distribution of income. • The specific factors model. While labor can move freely between sectors, there are other factors specific to particular industries. This model is ideal for understanding income distribution but awkward for discussing the pattern of trade. • The Heckscher-Ohlin model. Multiple factors of production can move between sectors. This is a harder model to work with than the first two but conveys a deeper understanding of how resources may drive trade patterns. When we analyze real problems, we want to base our insights on a mixture of the models. For example, in the 1990s one of the central changes in world trade was the rapid growth in exports from newly industrializing economies. These countries experienced rapid productivity growth; to discuss the implications of this productivity growth we may want to apply the Ricardian model of Chapter 2. The changing pattern of trade has differential effects on different groups in the United States; to understand the effects of increased Pacific trade for U.S. income distribution, we may want to apply the specific factors model of Chapter 3. Finally, over time the resources of the newly industrializing nations have changed, as they accumulate capital and their labor grows more educated, while unskilled labor becomes scarcer. To understand the implications of this shift, we may wish to turn to the Heckscher-Ohlin model of Chapter 4. In spite of the differences in their details, our models share a number of features: 1. The productive capacity of an economy can be summarized by its production possibility frontier, and differences in these frontiers give rise to trade. 2. Production possibilities determine a country's relative supply schedule.

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3. World equilibrium is determined by world relative demand and a world relative supply schedule that lies between the national relative supply schedules. Because of these common features, the models we have studied may be viewed as special cases of a more general model of a trading world economy. There are many important issues in international economics whose analysis can be conducted in terms of this general model, with only the details depending on which special model you choose. These issues include the effects of shifts in world supply resulting from economic growth; shifts in world demand resulting from foreign aid, war reparations, and other international transfers of income; and simultaneous shifts in supply and demand resulting from tariffs and export subsidies. This chapter stresses those insights from international trade theory that are not strongly dependent on the details of the economy's supply side. We develop a standard model of a trading world economy of which the models of Chapters 2,3, and 4 can be regarded as special cases and use this model to ask how a variety of changes in underlying parameters affect the world economy. •

Standard Model of a Trading Economy The standard trade model is built on four key relationships: (1) the relationship between the production possibility frontier and the relative supply curve; (2) the relationship between relative prices and relative demand; (3) the determination of world equilibrium by world relative supply and world relative demand; and (4) the effect of the terms of trade—the price of a country's exports divided by the price of its imports—on a nation's welfare. Production Possibilities and Relative Supply For the purposes of our standard model we assume that each country produces two goods, food (F) and cloth (C), and that each country's production possibility frontier is a smooth curve like that illustrated by 7Tin Figure 5-1. ! The point on its production possibility frontier at which an economy actually produces depends on the price of cloth relative to food, PC/PF. It is a basic proposition of microeconomics that a market economy that is not distorted by monopoly or other market failures is efficient in production, that is, maximizes the value of output at given market prices, PCQC +

P

FQF-

We can indicate the market value of output by drawing a number of isovalue lines—that is, lines along which the value of output is constant. Each of these lines is defined by an equation of the form PCQC + PFQF = K or by rearranging, QF = VIPF - (PCIPF)QC, where V is the value of output. The higher V is, the farther out an isovalue line lies; thus isovalue lines farther from the origin correspond to higher values of output. The slope of an isovalue line is minus the relative price of cloth. The economy will produce the highest value of

'We have seen that when there is only one factor of production, as in Chapter 2, the production possibility frontier is a straight line. For most models, however, it will be a smooth curve, and the Ricardian result can be viewed as an extreme case.

CHAPTER 5

igure 5-1

The Standard Trade Model

Relative Prices Determine the Economy's Output

An economy whose production possibility frontier is TT will produce at Q,

Food production, QF

which is on the highest possible isovalue line.

Isovatue lines

TT Cloth production, Qc

output it can, which can be achieved by producing at point Q, where TT is just tangent to an isovalue line.2 Now suppose that PCIPF were to rise. Then the isovalue lines would be steeper than before. In Figure 5-2 the highest isovalue line the economy could reach before the change in PCIPF is shown as VV1; the highest line after the price change is VV2, the point at which the economy produces shifts from Q] to Q2. Thus, as we might expect, a rise in the relative price of cloth leads the economy to produce more cloth and less food. The relative supply of cloth will therefore rise when the relative price of cloth rises.

Relative Prices and Demand Figure 5-3 shows the relationship among production, consumption, and trade in the standard model. As we pointed out in Chapter 3, the value of an economy's consumption equals the value of its production:

PCCQ QC

=

P D

c c

P D

F F

=

where Dc and DF are the consumption of cloth and food, respectively. The equation above says that production and consumption must lie on the same isovalue line.

2

In our analysis of the specific factors model in Chapter 3 we showed explicitly that the economy always produces at a point on its production possibility curve where the slope of that curve equals the ratio of the two goods prices—that is, where the price line is tangent to the production possibility curve. Students may want to refer back to p. 46 in Chapter 3 to refresh their intuition.

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How an Increase in the Relative Price of Cloth Affects Relative Supply The isovalue lines become steeper when the relative price of cloth rises

Food production, QF

from (PC!PFY to (PCIPF)2 (shown by the rotation from VV1 to VV2). As a result, the economy produces more cloth and less food and the equilibrium output shifts from Q1 to Q2.

VV2{PC/PF)2 TT Cloth production, Qc

The economy's choice of a point on the isovalue line depends on the tastes of its consumers. For our standard model, we make the useful simplifying assumption that the economy's consumption decisions may be represented as if they were based on the tastes of a single representative individual.3 The tastes of an individual can be represented graphically by a series of indifference curves. An indifference curve traces a set of combinations of cloth (C) and food (F) consumption that leave the individual equally well off. Indifference curves have three properties: 1. They are downward sloping: If an individual is offered less F, then to be made equally well off she must be given more C. 2. The farther up and to the right an indifference curve lies, the higher the level of welfare to which it corresponds: An individual will prefer more of both goods to less. 3. Each indifference curve gets flatter as we move to the right: The more C and the less F an individual consumes, the more valuable a unit of F is at the margin compared with a unit of C, so more C will have to be provided to compensate for any further reduction in F. 3

There are several sets of circumstances that can justify this assumption. One is that all individuals have the same tastes and the same share of all resources. Another is t .at the government redistributes income so as to maximize its view of overall social welfare. Essentially, the assumption requires that effects of changing income distribution on demand not be too important.

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Figure 5-3 Production, Consumption, and Trade in the Standard Model The economy produces at point

Food production, QF

Q, where the production possibility frontier is tangent to the highest possible isovalue line. It

Indifference curves

consumes at point D, where that isovalue line is tangent to the highest possible indifference curve. The economy produces

Food imports

more cloth than it consumes and therefore exports cloth; correspondingly, it consumes more food than it produces

Isovalue line

and therefore imports food.

Cloth exports

Cloth production, Qc

In Figure 5-3 we show a set of indifference curves for the economy that have these three properties. The economy will choose to consume at the point on the isovalue line that yields the highest possible welfare. This point is where the isovalue line is tangent to the highest reachable indifference curve, shown here as point D. Notice that at this point the economy exports cloth (the quantity of cloth produced exceeds the quantity of cloth consumed) and imports food. (If this is not obvious, refer back to our discussion of the pattern of trade in Chapter 3.) Now consider what happens when PCIPF is increased. In Figure 5-4 we show the effects. First, the economy produces more C and less F, shifting production from Q} to Q2. This shifts the isovalue line on which consumption must lie, from VV1 to VV2. The economy's consumption choice therefore also shifts, from D] to D2. The move from D1 to D2 reflects two effects of the rise in PC/PF. First, the economy has moved to a higher indifference curve: It is better off. The reason is that this economy is an exporter of cloth. When the relative price of cloth rises, the economy can afford to import more food for any given volume of exports. Thus the higher relative price of its export good represents an advantage. Second, the change in relative prices leads to a shift along the indifference curve, toward food and away from cloth. These two effects are familiar from basic economic theory. The rise in welfare is an income effect; the shift in consumption at any given level of welfare is a substitution effect. The income effect tends to increase consumption of both goods, while the substitution effect acts to make the economy consume less C and more F

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Figure 5-4 Effects of a Rise in the Relative Price of Cloth The slope of the isovalue lines is equal to minus the relative price of cloth

Food production, QF

Pc/Pf, so when that relative price rises all isovalue lines become steeper. In particular, the maximum-value line rotates from VV" to VV2. Production shifts from Q1 to Q2; consumption shifts from D1 to D 2 .

VV2(PC/PF) 77" Cloth production, Q c

It is possible in principle that the income effect will be so strong that when PCIPF rises, consumption of both goods actually rises. Normally, however, the ratio of C consumption to F consumption will fall, that is, relative demand for C will decline. This is the case shown in the figure. The Welfare Effect of Changes in the Terms of Trade When PCIPF increases, a country that initially exports cloth is made better off, as illustrated by the movement from D1 to D2 in Figure 5-4. Conversely, if PC/PF were to decline, the country would be made worse off; for example, consumption might move back from D2 to D\ If the country were initially an exporter of food instead of cloth, the direction of this effect would of course be reversed. An increase in PCIPF would mean a fall in PFIPC, and the country would be worse off; a fall in PCIPF would make it better off. We cover all cases by defining the terms of trade as the price of the good a country initially exports divided by the price of the good it initially imports. The general statement, then, is that a rise in the terms of trade increases a country's welfare, while a decline in the terms of trade reduces its welfare. Determining Relative Prices Let's now suppose that the world economy consists of two countries, once again named Home (which exports cloth) and Foreign (which exports food). Home's terms of trade are

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vorld Relative Supply and Demand The higher PC/PF is, the larger the world supply of cloth relative to food

Relative price of cloth, PCIPF

(RS) and the lower the world demand for cloth relative to food (RD). Equilibrium relative price (here, (Pc/Pf)') is determined by the intersection of the world relative supply and demand curves.

Relative quantity of cloth, ^ ^ r

measured by PCIPF, while Foreign's are measured by PFIPC. Qc and QF are the quantities of cloth and food produced by Home: Q* and Q* are the quantities produced by Foreign. To determine PCIPF we find the intersection of world relative supply of cloth and world relative demand. The world relative supply curve (RS in Figure 5-5) is upward sloping because an increase in PCIPF leads both countries to produce more cloth and less food. The world relative demand curve (RD) is downward sloping because an increase in PCIPF leads both countries to shift their consumption mix away from cloth toward food. The intersection of the curves (point 1) determines the equilibrium relative price (PC/PF)1. Now that we know how relative supply, relative demand, the terms of trade, and welfare are determined in the standard model, we can use it to understand a number of important issues in international economics. Economic Growth: A Shift of the RS Curve The effects of economic growth in a trading world economy are a perennial source of concern and controversy. The debate revolves around two questions. First, is economic growth in other countries good or bad for our nation? Second, is growth in a country more or less valuable when that nation is part of a closely integrated world economy? In assessing the effects of growth in other countries, commonsense arguments can be made on either side. On one side, economic growth in the rest of the world may be good for our economy because it means larger markets for our exports. On the other side, growth in other countries may mean increased competition for our exporters. Similar ambiguities seem present when we look at the effects of growth at home. On one hand, growth in an economy's production capacity should be more valuable when that country can sell some of its increased production to the world market. On the other hand, the benefits of growth may be passed on to foreigners in the form of lower prices for the country's exports rather than retained at home.

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The standard model of trade developed in the last section provides a framework that can cut through these seeming contradictions and clarify the effects of economic growth in a trading world. Growth and the Production Possibility Frontier

Economic growth means an outward shift of a country's production possibility frontier. This growth can result either from increases in a country's resources or from improvements in the efficiency with which these resources are used. The international trade effects of growth result from the fact that such growth typically has a bias. Biased growth takes place when the production possibility frontier shifts out more in one direction than in the other. Figure 5-6a illustrates growth biased toward cloth, and Figure 5-6b shows growth biased toward food. In each case the production possibility frontier shifts from 7T 1 to TT2. Growth may be biased for two main reasons: 1. The Ricardian model of Chapter 2 shows that technological progress in one sector, of the economy will expand the economy's production possibilities more in the direction of that sector's output than in the direction of the other sector's output.

Figure 5-6 Biased Growth Food production, QF

Food production, QF

TT'

TT' Cloth production, Qc (a) Growth biased toward cloth

Cloth production, Qc (b) Growth biased toward food

Growth is biased when it shifts production possibilities out more toward one good than toward another. In both cases shown the production possibility frontier shifts out from IT 1 to TT1. In case (a) this shift is biased toward cloth, in case (b) toward food.

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2. The specific factors model of Chapter 3 and the factor proportions model of Chapter 4 both showed that an increase in a country's supply of a factor of production—say, an increase in the capital stock resulting from saving and investment—will produce biased expansion of production possibilities. The bias will be in the direction of either the good to which the factor is specific or the good whose production is intensive in the factor whose supply has increased. Thus the same considerations that give rise to international trade will also lead to biased growth in a trading economy. The biases of growth in Figure 5-6a and 5-6b are strong. In each case the economy is able to produce more of both goods, but at an unchanged relative price of cloth the output of food actually falls in Figure 5-6a, while the output of cloth actually falls in Figure 5-6b. Although growth is not always as strongly biased as it is in these examples, even growth that is more mildly biased toward cloth will lead, for any given relative price of cloth, to a rise in the output of cloth relative to that of food. The reverse is true for growth biased toward food.

Relative Supply and the Terms of Trade Suppose now that Home experiences growth strongly biased toward cloth, so that its output of cloth rises at any given relative price of cloth, while its output of food declines. Then for the world as a whole the output of cloth relative to food will rise at any given price and the world relative supply curve will shift to the right from RS1 to RS2 (Figure 5-7a). This shift results in a decrease in the relative price of cloth from (PCIPF)X to (PC/PF)2, a worsening of Home's terms of trade and an improvement in Foreign's terms of trade. Notice that the important consideration here is not which economy grows but the bias of the growth. If Foreign had experienced growth biased toward cloth, the effect on the relative supply curve and thus on the terms of trade would have been the same. On the other hand, either Home or Foreign growth biased toward food (Figure 5-7b) leads to a leftward shift of the RS curve (RS1 to RS2) and thus to a rise in the relative price of cloth from (PC/PF)1 to (PCIPF)2. This increase is an improvement in Home's terms of trade, a worsening of Foreign's. Growth that disproportionately expands a country's production possibilities in the direction of the good it exports (cloth in Home, food in Foreign) is export-biased growth. Similarly, growth biased toward the good a country imports is import-biased growth. Our analysis leads to the following general principle: Export-biased growth tends to worsen a growing country's terms of trade, to the benefit of the rest of the world; import-biased growth tends to improve a growing country's terms of trade at the rest of the world's expense.

International Effects of Growth Using this principle, we are now in a position to resolve our questions about the international effects of growth. Is growth in the rest of the world good or bad for our country? Does the fact that our country is part of a trading world economy increase or decrease the benefits of growth? In each case the answer depends on the bias of the growth. Exportbiased growth in the rest of the world is good for us, improving our terms of trade, while import-biased growth abroad worsens our terms of trade. Export-biased growth in our own

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Figure 5-7 Growth and Relative Supply Relative price of cloth, PCIPF

Relative price of cloth, PC/PF

(pc/pF)

* - - S

Relative quantity of cloth,

Qc+Q"c

(a) Cloth-biased growth

Relative quantity of cloth,

Qc+

(b) Food-biased growth

Growth biased toward cloth shifts the RS curve to the right (a), while growth biased toward food shifts it to the left (b).

country worsens our terms of trade, reducing the direct benefits of growth, while importbiased growth leads to an improvement of our terms of trade, a secondary benefit. During the 1950s, many economists from poorer countries believed that their nations, which primarily exported raw materials, were likely to experience steadily declining terms of trade over time. They believed that growth in the industrial world would be marked by an increasing development of synthetic substitutes for raw materials, while growth in the poorer nations would take the form of a further extension of their capacity to produce what they were already exporting rather than a move toward industrialization. That is, the growth in the industrial world would be import biased, while that in the less developed world would be export biased. Some analysts suggested that growth in the poorer nations would actually be self-defeating. They argued that export-biased growth by poor nations would worsen their terms of trade so much that they would be worse off than if they had not grown at all. This situation is known to economists as the case of immiserizing growth. In a famous paper published in 1958, the economist Jagdish Bhagwati of Columbia University showed that such perverse effects of growth can in fact arise within a rigorously specified economic model.4 The conditions under which immiserizing growth can occur

4

"Immiserizing Growth: A Geometrical Note," Review of Economic Studies 25 (June 1958), pp. 201-205.

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103

are, however, extreme: Strongly export-biased growth must be combined with very steep RS and RD curves, so that the change in the terms of trade is large enough to offset the initial favorable effects of an increase in a country's productive capacity. Most economists now regard the concept of immiserizing growth as more a theoretical point than a realworld issue. While growth at home normally raises our own welfare even in a trading world, however, this is by no means true of growth abroad. Import-biased growth is not an unlikely possibility, and whenever the rest of the world experiences such growth, it worsens our terms of trade. Indeed, as we point out below, it is possible that the United States has suffered some loss of real income because of foreign growth over the postwar period.

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Has the Growth of Newly Industrializing Countries Hurt Advanced Nations? In the early 1990s, many observers began warning that the growth of newly industrializing economies poses a threat to the prosperity of advanced nations. In the case study in Chapter 4 on North-South trade we addressed one way in which that growth might prove a problem: It might aggravate the growing gap in incomes between high-skilled and low-skilled workers in advanced nations. Some alarmists, however, believed that the threat was still broader—that the overall real income of advanced nations, as opposed to its distribution, had been or would be reduced by the appearance of new competitors. For example, a 1993 report released by the European Commission (the administrative arm of the European Union), in listing reasons for Europe's economic difficulties, emphasized the fact that "other countries are becoming industrialized and competing with us—even on our own markets—at cost levels which we simply cannot match." Another report by an influential private organization went even further, arguing that the rising productivity of low-wage countries would put immense pressure on high-wage nations, to such an extent that "the raison d'etre of many countries is at stake."5 Are these concerns justified? At first look it may seem obvious that the growth of formidable new competitors threatens a country's standard of living. As we have just seen, however, the effect of growth abroad on income at home is by no means necessarily, or even presumptively, negative. The effect of one country's growth on another country's real income depends on the bias of that growth; only if it is biased toward the other country's exports will it reduce its real income via worsened terms of trade. It is difficult to determine the direction of bias in the growth of newly industrializing economies. It is easy, however, to check directly whether the terms of trade of advanced countries have in fact deteriorated sufficiently to be a major drag on their real incomes. Table 5-1, from the International Monetary Fund, shows average annual percentage changes in the terms of trade for three groups of countries over two decades (the numbers for 1993-2002 are partly a

'Commission of the European Communities, Growth, Competitiveness, Employment, Brussels 1993; World Economic Forum, World Competitiveness Report 1994.

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Table 5-1

Average Annual Percent Changes in Terms of Trade

Advanced countries Oil-exporting developing countries Non-oil-exporting developing countries

1983-1992

1993-2002

1.1 -7.5 -0.6

0.1 2.0 -0.2

Source: International Monetary Fund, World Economic Outlook, May 2001.

projection but seem to have come out about right). The first group is the advanced countries; the second consists of developing countries that export oil; the third, which includes almost all of the newly industrializing countries of Asia, comprises developing countries that do not export oil. If the claim that competition from newly industrializing economies hurts advanced countries were true, we should see large negative numbers for the terms of trade of advanced countries. In the Mathematical Postscript to this chapter we show that the percentage real income effect of a change in the terms of trade is approximately equal to the percent change in the terms of trade, multiplied by the share of imports in income. Since advanced countries on average spend about 20 percent of their income on imports, a 1 percent decline in the terms of trade would reduce real income by only about 0.2 percent. So the terms of trade would have to decline by several percent per year to be a noticeable drag on economic growth. What we actually see is that the terms of trade of advanced countries improved between 1983 and 1992 and showed little change thereafter. The main reason for the improvement was a decline in the price of oil; that's why the terms of trade of oil-exporting countries showed a sharp decline. The lesson from these numbers is that any adverse impact of competition from developing countries on advanced countries was too small to be visible in the data—and therefore too small to matter.

ternational Transfers of Income: Shifting the RD Curve We now turn from terms of trade changes originating on the supply side of the world economy to changes that originate on the demand side. Relative world demand for goods may shift for many reasons. Tastes may change: With rising concern over cholesterol, demand for fish has risen relative to the demand for red meat. Technology may also change demand: Whale oil fueled lamps at one time but was supplanted by kerosene, later by gas, and finally by electricity. In international economics, however, perhaps the most important and controversial issue is the shift in world relative demand that can result from international transfers of income. In the past, transfers of income between nations often occurred in the aftermath of wars. Germany demanded a payment from France after the latter's defeat in the Franco-Prussian war of 1871; after World War I the victorious Allies demanded large reparations payments from Germany (mostly never paid). After World War II, the United States provided aid to

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defeated Japan and Germany as well as to its wartime allies to help them rebuild. Since the 1950s, advanced countries have provided aid to poorer nations, although the sums have made a major contribution to the income of only a few of the very poorest countries. International loans are not strictly speaking transfers of income, since the current transfer of spending power that a loan implies comes with an obligation to repay later. In the short run, however, the economic effects of a sum of money given outright to a nation and the same sum lent to that nation are similar. Thus an analysis of international income transfers is also useful in understanding the effects of international loans. The Transfer Problem The issue of how international transfers affect the terms of trade was raised in a famous debate between two great economists, Bertil Ohlin (one of the originators of the factorproportions theory of trade) and John Maynard Keynes. The subject of the debate was the reparations payments demanded of Germany after World War I, and the question was how much of a burden these payments represented to the German economy,6 Keynes, who made a forceful case that the vengeful terms of the Allies (the "Carthaginian peace") were too harsh, argued that the monetary sums being demanded were an understatement of the true burden on Germany. He pointed out that to pay money to other countries Germany would have to export more and import less. To do this, he argued, Germany would have to make its exports cheaper relative to its imports. The resulting worsening of Germany's terms of trade would add an excess burden to the direct burden of the payment. Ohlin questioned whether Keynes was right in assuming that Germany's terms of trade would worsen. He counterargued that when Germany raised taxes to finance its reparations, its demand for foreign goods would automatically decrease. At the same time, the reparation payment would be distributed in other countries in the form of reduced taxes or increased government spending, and some of the resulting increased foreign demand would be for German exports. Thus Germany might be able to reduce imports and increase exports without having its terms of trade worsen. In the particular case in dispute the debate turned out to be beside the point: In the end, Germany paid very little of its reparations. The issue of the terms of trade effects of a transfer, however, arises in a surprisingly wide variety of contexts in international economics. Effects of a Transfer on the Terms of Trade If Home makes a transfer of some of its income to Foreign, Home's income is reduced, and it must reduce its expenditure. Correspondingly, Foreign increases its expenditure. This shift in the national division of world spending may lead to a shift in world relative demand and thus affect the terms of trade. The shift in the RD curve (if it occurs) is the only effect of a transfer of income. The RS curve does not shift. As long as only income is being transferred, and not physical resources like capital equipment, the production of cloth and food for any given relative price will not change in either country. Thus the transfer problem is a purely demand-side issue.

'See Keynes, "The German Transfer Problem" and Ohlin, "The German Transfer Problem: A Discussion," both in Economic Journal 39 (1929), pp. 1-7 and pp. 172-182, respectively.

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The RD curve does not necessarily shift when world income is redistributed, however (this was Ohlin's point). If Foreign allocates its extra income between cloth and food in the same proportions that Home reduces its spending, then world spending on cloth and food will not change. The RD curve will not shift, and there will be no terms of trade effect. If the two countries do not allocate their change in spending in the same proportions, however, there will be a terms of trade effect; the direction of the effect will depend on the difference in Home and Foreign spending patterns. Suppose that Home allocates a higher proportion of a marginal shift in expenditure to cloth than Foreign does. That is. Home has a higher marginal propensity to spend on cloth than Foreign. (Correspondingly, Home in this case must have a lower marginal propensity to spend on food.) Then at any given relative price Home's transfer payment to Foreign reduces demand for cloth and increases demand for food. In this case the RD curve shifts to the left, from RD[ to RD2 (Figure 5-8) and equilibrium shifts from point 1 to point 2. This shift lowers the relative price of cloth from (PclPh){ to {PCIPF)1, worsening Home's terms of trade (because it exports cloth) while improving Foreign's, This is the case that Keynes described: The indirect effect of an international transfer on terms of trade reinforces its original effect on the incomes of the two countries. There is, however, another possibility. If Home has a lower marginal propensity to spend on cloth, a transfer by Home to Foreign shifts the RD curve right, and improves Home's terms of trade at Foreign's expense. This effect offsets both the negative effect on Home's income and the positive effect on Foreign's income. In general, then, a transfer worsens the donor's terms of trade if the donor has a higher marginal propensity to spend on its export good than the recipient. If the donor has a lower marginal propensity to spend on its export, its terms of trade will actually improve.

-8 Effects of a Transfer on the Terms of Trade If Home has a higher marginal propensity to spend on cloth than Foreign, a

Relative price of cloth, PCIPF

transfer of income by Home to Foreign shifts the RD curve left from RD1 to RD2, reducing the equilibrium relative price of cloth.

(Pcf

(P c / RD' RD' Relative quantity Q +O

c c

of cloth,

n

.n.

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A paradoxical possibility is implied by this analysis. A transfer payment—say foreign aid—could conceivably improve the donor's terms of trade so much that it leaves the donor better off and the recipient worse off. In this case it is definitely better to give than to receive! Some theoretical work has shown that this paradox, like the case of immiserizing growth, is possible in a rigorously specified model. The conditions are, however, even more stringent than those for immiserizing growth, and this possibility is almost surely purely theoretical.7 This analysis shows that the terms of trade effects of reparations and foreign aid can go either way. Thus Ohlin was right about the general principle. Many would still argue, however, that Keynes was right in suggesting that there is a presumption that transfers cause terms of trade effects that reinforce their effects on the incomes of donors and recipients. Presumptions about the Terms of Trade Effects of Transfers A transfer will worsen the donor's terms of trade if the donor has a higher marginal propensity to spend on its export good than the recipient. If differences in marginal propensities to spend were simply a matter of differences in taste, there would be no presumption either way: Which good a country exports depends for the most part on differences in technology or resources, which need have nothing to do with tastes. When we look at actual spending patterns, however, each country seems to have a relative preference for its own goods. The United States, for example, produces only about 25 percent of the value of output of the world's market economies, so that total sales of U.S. goods are 25 percent of world sales. If spending patterns were the same everywhere, the United States would spend only 25 percent of its income on U.S. products. In fact, imports are only 11 percent of national income; that is, the United States spends 89 percent of its income domestically. On the other hand, the rest of the world spends less than 3 percent of its income on U.S. products. This difference in spending patterns certainly suggests that if the United States were to transfer some of its income to foreigners, the relative demand for U.S. goods would fall and the U.S. terms of trade would decline, just as Keynes argued. The United States spends so much of its income at home because of barriers to trade, both natural and artificial. Transportation costs, tariffs (taxes on imports), and import quotas (government regulations that limit the quantity of imports) cause residents of each country to buy a variety of goods and services at home rather than import them from abroad. As we noted in Chapter 2, the effect of such barriers to trade is to create a set of nontraded goods. Even if every country divides its income among different goods in the same proportions, local purchase of nontraded goods will ensure that spending has a national bias. Consider the following example. Suppose that there are not two but three goods: cloth, food, and haircuts. Only Home produces cloth; only Foreign produces food. Haircuts, however, are a nontraded good that each country produces for itself. Each country spends onethird of its income on each good. Even though these countries have the same tastes, each of them spends two-thirds of its income domestically and only one-third on imports.

7

For examples of how an immiserizing transfer might occur, see Graciela Chichilnisky, "Basic Goods, the Effects of Commodity Transfers and the International Economic Order," Journal of Development Economics 1 (1980), pp. 505-519; and Jagdish Bhagwati, Richard Brecher, and Tatsuo Hatta, "The Generalized Theory of Transfers and Welfare," American Economic Review 73 (1983), pp. 606-618.

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Nontraded goods can give rise to what looks like a national preference for all goods produced domestically. But to analyze the effects of a transfer on the terms of trade we need to know what happens to the supply and demand for exports. Here the crucial point is that a country's nontraded goods compete with exports for resources. A transfer of income from the United States to the rest of the world lowers the demand for nontraded goods in the United States, releasing resources that can be used to produce U.S. exports. As a result, the supply of U.S. exports rises. At the same time, the transfer of income from the United States to the rest of the world increases the rest of the world's demand for nontraded goods because some of that income is spent on haircuts and other nontradables. The increase in the demand for nontraded goods in the rest of the world draws foreign resources away from exports and reduces the supply of foreign exports (which are U.S. imports). The result is that a transfer by the United States to other countries may lower the price of U.S. exports relative to foreign, worsening U.S. terms of trade. Demand shifts also cause resources to move between the nontraded and import-competing sectors. As a practical matter, however, most international economists believe that the effect of barriers to trade is to validate the presumption that an international transfer of income worsens the donor's terms of trade. Thus, Keynes was right in practice.

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The Transfer Problem and the Asian Crisis In 1997 to 1998, several Asian nations—including Thailand, Indonesia, Malaysia, and South Korea—experienced a sudden reversal of international capital flows. During the preceding few years, these nations, as the favorites of international investors, had attracted large inflows of money, allowing them to import considerably more than they exported. But confidence in these economies collapsed in 1997; foreign banks that had been lending heavily to Asian companies now demanded that the loans be repaid, stock market investors began selling off their holdings, and many domestic residents also began shifting funds overseas. We discuss the causes of this crisis, and the disputes that have raged over its management, in Chapter 22. For now we simply note that whatever the reasons investors first blew hot, then cold, on Asian economies, in effect these economies went quickly from receiving large inward transfers to making large outward transfers. If Keynes's presumption about the effects of transfers were right, this reversal of fortune should have produced a noticeable deterioration of Asian terms of trade, exacerbating what was already a severe economic blow. In fact, some observers worried that with so many countries in crisis at the same time and all trying to export more simultaneously, their terms of trade would drastically deteriorate, making the crisis that much worse. As it turned out, however, the terms of trade of developing countries in Asia did not worsen nearly as much as feared. Export prices fell sharply: in 1998 developing countries in Asia exported the same volume of goods as they had in 1997, but the dollar value of their exports dropped 8 percent. However, import prices also fell.

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109

What seems to have saved Asia from a severe transfer problem was that other things were happening at the same time. Oil prices fell sharply, benefitting all the crisis countries except Indonesia. Japan, the leading exporter to the region, also saw its export prices fall as the yen plunged against the U.S. dollar. So there probably was a transfer problem for Asia, but its effects were masked by other forces.

riffs and Export Subsidies: multaneous Shifts in RS and RD Import tariffs (taxes levied on imports) and export subsidies (payments given to domestic producers who sell a good abroad) are not usually put in place to affect a country's terms of trade. These government interventions in trade usually take place for income distribution, for the promotion of industries thought to be crucial to the economy, or for balance of payments (these motivations are examined in Chapters 9, 10, and 11). Whatever the motive for tariffs and subsidies, however, they do have terms of trade effects that can be understood by using the standard trade model. The distinctive feature of tariffs and export subsidies is that they create a difference between prices at which goods are traded on the world market and their prices within a country. The direct effect of a tariff is to make imported goods more expensive inside a country than they are outside. An export subsidy gives producers an incentive to export. It will therefore be more profitable to sell abroad than at home unless the price at home is higher, so such a subsidy raises the price of exported goods inside a country. The price changes caused by tariffs and subsidies change both relative supply and relative demand. The result is a shift in the terms of trade of the country imposing the policy change and in the terms of trade of the rest of the world. Relative Demand and Supply Effects of a Tariff Tariffs and subsidies drive a wedge between the prices at which goods are traded internationally (external prices) and the prices at which they are traded within a country (internal prices). This means that we have to be careful in defining the terms of trade. The terms of trade are intended to measure the ratio at which countries exchange goods; for example, how many units of food can Home import for each unit of cloth that it exports? The terms of trade therefore correspond to external, not internal, prices. When analyzing the effects of a tariff or export subsidy, we want to know how it affects relative supply and demand as a function of external prices. If Home imposes a 20 percent tariff on the value of food imports, the internal price of food relative to cloth faced by Home producers and consumers will be 20 percent higher than the external relative price of food on the world market. Equivalently, the internal relative price of cloth on which Home residents base their decisions will be lower than the relative price on the external market. At any given world relative price of cloth, then, Home producers will face a lower relative cloth price and therefore will produce less cloth and more food. At the same time,

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Figure 5-9 Effects of a Tariff on the Terms of Trade An import tariff imposed by Home both reduces the relative supply of

Relative price of cloth, PC/PF

cloth (from RS1 to RS2) and increases the relative demand (from RD1 to RD2). As a result, the relative price of cloth must rise.

(w1-/-

. RD2

Relative quantity a +Q

of cloth,

c c

Home consumers will shift their consumption toward cloth and away from food. From the point of view of the world as a whole, the relative supply of cloth will fall (from RSl to RS2 in Figure 5-9) while the relative demand for cloth will rise (from RD[ to RD2). Clearly, the world relative price of cloth rises from (Pc/PFy to (PC/PF)2, and thus Home's terms of trade improve at Foreign's expense. The extent of this terms of trade effect depends on how large the country imposing the tariff is relative to the rest of the world—if the country is only a small part of the world, it cannot have much effect on world relative supply and demand and therefore cannot have much effect on relative prices. If the United States, a very large country, were to impose a 20 percent tariff, some estimates suggest that the U.S. terms of trade might rise by 15 percent. That is, the price of U.S. imports relative to exports might fall by 15 percent on the world market, while the relative price of imports would rise only 5 percent inside the United States. On the other hand, if Luxembourg or Paraguay were to impose a 20 percent tariff, the terms of trade effect would probably be too small to measure. Effects of an Export Subsidy Tariffs and export subsidies are often treated as similar policies, since they both seem to support domestic producers, but they have opposite effects on the terms of trade. Suppose that Home offers a 20 percent subsidy on the value of any cloth exported. For any given world prices this subsidy will raise Home's internal price of cloth relative to food by 20 percent. The rise in the relative price of cloth will lead Home producers to produce more cloth and less food, while leading Home consumers to substitute food for cloth. As illustrated in Figure 5-10, the subsidy will increase the world relative supply of cloth (from RS1 to RS2) and decrease the world relative demand for cloth (from RDX to RD2), shifting equi-

CHAPTER 5

Figure 5-10

The Standard Trade Model

Effects of a Subsidy on the Terms of Trade

An export subsidy's effect are the reverse of those of a tariff. Relative

Relative price of cloth,

supply of cloth rises, while relative

RS2

demand falls. Home's terms of trade decline as the relative price of cloth falls from (PC/PF)' to (PC/PF)2.

Relative quantity Qc+ Q*c

of cloth,

n

n.

librium from point 1 to point 2. A Home export subsidy worsens Home's terms of trade and improves Foreign's.

Implications of Terms of Trade Effects: Who Gains and Who Loses? The question of who gains and who loses from tariffs and export subsidies has two dimensions. First is the issue of the international distribution of income: second is the issue of the distribution of income within each of the countries. The International Distribution of I n c o m e . If Home imposes a tariff, it improves its terms of trade at Foreign's expense. Thus tariffs hurt the rest of the world. The effect on Home's welfare is not quite as clear-cut. The terms of trade improvement benefits Home; however, a tariff also imposes costs by distorting production and consumption incentives within Home's economy (see Chapter 8). The terms of trade gains will outweigh the losses from distortion only as long as the tariff is not too large: We will see later how to define an optimum tariff that maximizes net benefit. (For small countries that cannot have much impact on their terms of trade, the optimum tariff is near zero.) The effects of an export subsidy are quite clear. Foreign's terms of trade improve at Home's expense, leaving it clearly better off. At the same time, Home loses from terms of trade deterioration and from the distorting effects of its policy. This analysis seems to show that export subsidies never make sense. In fact, it is difficult to come up with any situation in which export subsidies would serve the national interest. The use of export subsidies as a policy tool usually has more to do with the peculiarities of trade politics than with economic logic.

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Are foreign tariffs always bad for a country and foreign export subsidies always beneficial? Not necessarily. Our model is of a two-country world, where the other country exports the good we import and vice versa. In the real world of many countries, a foreign government may subsidize the export of a good that competes with U.S. exports; this foreign subsidy will obviously hurt the U.S. terms of trade. A good example of this effect is European subsidies to agricultural exports (see Chapter 8). Alternatively, a country may impose a tariff on something the United States also imports, lowering its price and benefiting the United States. We thus need to qualify our conclusions from a two-country analysis: Subsidies to exports of things the United States imports help us, while tariffs against U.S. exports hurt us. The view that subsidized foreign sales to the United States are good for us is not a popular one. When foreign governments are charged with subsidizing sales in the United States, the popular and political reaction is that this is unfair competition. Thus when a Commerce Department study determined that European governments were subsidizing exports of steel to the United States, our government demanded that they raise their prices. The standard model tells us that when foreign governments subsidize exports to the United States, the appropriate response from a national point of view should be to send them a note of thanks! Of course this never happens, largely because of the effects of foreign subsidies on income distribution within the United States. If Europe subsidizes exports of steel to the United States, most U.S. residents gain from cheaper steel, but steelworkers, the owners of steel company stock, and industrial workers in general may not be so cheerful.

The Distribution of Income Within Countries.

Foreign tariffs or subsidies

change the relative prices of goods. Such changes have strong effects on income distribution because of factor immobility and differences in the factor intensity of different industries. At first glance, the direction of the effect of tariffs and export subsidies on relative prices, and therefore on income distribution, may seem obvious. A tariff has the direct effect of raising the internal relative price of the imported good, while an export subsidy has the direct effect of raising the internal relative price of the exported good. We have just seen, however, that tariffs and export subsidies have an indirect effect on a country's terms of trade. The terms of trade effect suggests a paradoxical possibility. A tariff might improve a country's terms of trade so much—that is, raise the relative price of its export good so much on world markets—that even after the tariff rate is added, the internal relative price of the import good falls. Similarly, an export subsidy might worsen the terms of trade so much that the internal relative price of the export good falls in spite of the subsidy. If these paradoxical results occur, the income distribution effects of trade policies will be just the opposite of what is expected. The possibility that tariffs and export subsidies might have perverse effects on internal prices in a country was pointed out and demonstrated by the University of Chicago economist Lloyd Metzler and is known as the Metzler paradox. 8 This paradox has roughly the same status as immiserizing growth and a transfer that makes the recipient worse off; that is,

8

See Metzler, "Tariffs, the Terms of Trade, and the Distribution of National Income," Journal of Political Economy 57 (February 1949), pp. 1-29.

CHAPTERS

The Standard Trade Model

it is possible in theory but will happen only under extreme conditions and is not likely in practice. Leaving aside the possibility of a Metzler paradox, then, a tariff will help the importcompeting sector at home while hurting the exporting sector; an export subsidy will do the reverse. These shifts in the distribution of income within countries are often more obvious and more important to the formation of policy than the shifts in the distribution of income between countries that result from changes in the terms of trade.

Summary 1. The standard trade model derives a world relative supply curve from production possibilities and a world relative demand curve from preferences. The price of exports relative to imports, a country's terms of trade, is determined by the intersection of the world relative supply and demand curves. Other things equal, a, rise in a country's terms of trade increases its welfare. Conversely, a decline in a country's terms of trade will leave the country worse off. 2. Economic growth means an outward shift in a country's production possibility frontier. Such growth is usually biased; that is, the production possibility frontier shifts out more in the direction of some goods than in the direction of others. The immediate effect of biased growth is to lead, other things equal, to an increase in the world relative supply of the goods toward which the growth is biased. This shift in the world relative supply curve in turn leads to a change in the growing country's terms of trade, which can go in either direction. If the growing country's terms of trade improve, this improvement reinforces the initial growth at home but hurts the rest of the world. If the growing country's terms of trade worsen, this decline offsets some of the favorable effects of growth at home but benefits the rest of the world. 3. The direction of the terms of trade effects depends on the nature of the growth. Growth that is export-biased (growth that expands the ability of an economy to produce the goods it was initially exporting more than it expands the ability to produce goods that compete with imports) worsens the terms of trade. Conversely, growth that is importbiased, disproportionately increasing the ability to produce import-competing goods, improves a country's terms of trade. It is possible for import-biased growth abroad to hurt a country. 4. International transfers of income, such as war reparations and foreign aid, may affect a country's terms of trade by shifting the world relative demand curve. If the country receiving a transfer spends a higher proportion of an increase in income on its export good than the giver, a transfer raises world relative demand for the recipient's export good and thus improves its terms of trade. This improvement reinforces the initial transfer and provides an indirect benefit in addition to the direct income transfer. On the other hand, if the recipient has a lower propensity to spend on its export at the margin than the donor, a transfer worsens the recipient's terms of trade, offsetting at least part of the transfer's effect. 5. In practice, most countries spend a much higher share of their income on domestically produced goods than foreigners do. This is not necessarily due to differences in

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taste but rather to barriers to trade, natural and artificial, which cause many goods to be nontraded. If nontraded goods compete with exports for resources, transfers will usually raise the recipient's terms of trade. The evidence suggests that this is, in fact, the case. 6. Import tariffs and export subsidies affect both relative supply and demand. A tariff raises relative supply of a country's import good while lowering relative demand. A tariff unambiguously improves the country's terms of trade at the rest of the world's expense. An export subsidy has the reverse effect, increasing the relative supply and reducing the relative demand for the country's export good, and thus worsening the terms of trade. 7. The terms of trade effects of an export subsidy hurt the subsidizing country and benefit the rest of the world, while those of a tariff do the reverse. This suggests that export subsidies do not make sense from a national point of view and that foreign export subsidies should be welcomed rather than countered. Both tariffs and subsidies, however, have strong effects on the distribution of income within countries, and these effects often weigh more heavily on policy than the terms of trade concerns.

Key Terms biased growth, p. 100 export-biased growth, p. 101 export subsidy, p. 109 external price, p. 109 immiserizing growth, p. 102 import-biased growth, p. 101 import tariff, p. 109 indifference curves, p. 96

internal price, p. 109 isovalue lines, p. 94 marginal propensity to spend, p. 106 Metzler paradox, p. 112 standard trade model, p. 94 terms of trade, p. 94 transfers of income, p. 104

Problems 1. In some economies relative supply may be unresponsive to changes in prices. For example, if factors of production were completely immobile between sectors, the production possibility frontier would be right-angled, and output of the two goods would not depend on their relative prices. Is it still true in this case that a rise in the terms of trade increases welfare? Analyze graphically. 2. The counterpart to immobile factors on the supply side would be lack of substitution on the demand side. Imagine an economy where consumers always buy goods in rigid proportions—for example, one yard of cloth for every pound of food—regardless of the prices of the two goods. Show that an improvement in the terms of trade benefits this economy, as well. 3. Japan primarily exports manufactured goods, while importing raw materials such as food and oil. Analyze the impact on Japan's terms of trade of the following events: a. A war in the Middle East disrupts oil supply. b. Korea develops the ability to produce automobiles that it can sell in Canada and the United States.

CHAPTERS

4.

5.

6.

7.

8.

The Standard Trade Model

c. U.S. engineers develop a fusion reactor that replaces fossil fuel electricity plants. d. A harvest failure in Russia. e. A reduction in Japan's tariffs on imported beef and citrus fruit. Countries A and B have two factors of production, capital and labor, with which they produce two goods, X and Y. Technology is the same in the two countries. X is capital intensive; A is capital abundant. Analyze the effects on the terms of trade and the welfare of the two countries of the following: a. An increase in A's capital stock. b. An increase in A's labor supply. c. An increase in B's capital stock. d. An increase in B's labor supply. It is just as likely that economic growth will worsen a country's terms of trade as that it will improve them. Why, then, do most economists regard immiserizing growth, where growth actually hurts the growing country, as unlikely in practice? In practice much foreign aid is "tied"; that is, it comes with restrictions that require that the recipient spend the aid on goods from the donor country. For example, France might provide money for an irrigation project in Africa, on the condition that the pumps, pipelines, and construction equipment be purchased from France rather than from Japan. How does such tying of aid affect the transfer problem analysis? Does tying of aid make sense from the donor's point of view? Can you think of a scenario in which tied aid actually makes the recipient worse off? During 1989 a wave of political change swept over Eastern Europe, raising prospects not only of democracy but also of a shift from centrally planned to market economies. One consequence might be a shift in how Western Europe uses its money: Nations, especially Germany, that during the 1980s were lending heavily to the United States might start to lend to nearby Eastern European nations instead. Using the analysis of the transfer problem, how do you think this should affect the prices of Western European goods relative to those from the United States and Japan? (Hint: how would the likely use of a dollar of financial resources differ in, say East Germany, from its use in the United States?) Suppose that one country subsidizes its exports and the other country imposes a "countervailing" tariff that offsets its effect, so that in the end relative prices in the second country are unchanged. What happens to the terms of trade? What about welfare in the two countries? Suppose, on the other hand, that the second country retaliates with an export subsidy of its own. Contrast the result.

Further Reading Rudiger Dornbusch, Stanley Fischer, and Paul Samuelson. "Comparative Advantage, Trade, and Payments in a Ricardian Model with a Continuum of Goods." American Economic Review (1977). This paper, cited in Chapter 2, also gives a clear exposition of the role of nontraded goods in establishing the presumption that a transfer improves the recipient's terms of trade. J. R. Hicks. "The Long Run Dollar Problem." Oxford Economic Papers 2 (1953), pp. 117-135. The modern analysis of growth and trade has its origins in the fears of Europeans, in the

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early years after World War II, that the United States had an economic lead that could not be overtaken (this sounds dated today, but many of the same arguments have now resurfaced about Japan). The paper by Hicks is the most famous exposition, Harry G. Johnson. "Economic Expansion and International Trade." Manchester School of Social and Economic Studies 23 (1955), pp. 95-112. The paper that laid out the crucial distinction between export- and import-biased growth, Paul Krugman. "Does Third World Growth Hurt First World Prosperity?" Harvard Business Review (July-August 1994), pp. 113-121. An analysis that attempts to explain why growth in developing countries need not hurt advanced countries in principle and probably does not do so in practice. Paul Samuelson. "The Transfer Problem and Transport Costs." Economic Journal 62 (1952), pp. 278-304 (Part I) and 64 (1954), pp. 264-289 (Part II). The transfer problem, like so many issues in international economics, was given its basic formal analysis by Paul Samuelson. John Whalley. Trade Liberalization Among Major World Trading Areas. Cambridge: MIT Press, 1985. The impact of tariffs on the international economy has been the subject of extensive study. Most impressive are the huge "computable general equilibrium" models, numerical models based on actual data that allow computation of the effects of changes in tariffs and other trade policies. Whalley's book presents one of the most carefully constructed of these.

CHAPTER 5

The Standard Trade Model

APPENDIX TO CHAPTER 5

Representing International Equilibrium with Offer Curves For most purposes, analyzing international equilibrium in terms of relative supply and demand is the simplest and most useful technique. In some circumstances, however, it is useful to analyze trade in a diagram that shows directly what each country ships to the other. A diagram that does this is the offer curve diagram. Deriving a Country's Offer Curve In Figure 5-3 we showed how to determine a country's production and'consumption given the relative price PCIPF. Trade is the difference between production and consumption. In an offer curve diagram we show directly the trade flows that correspond to any given relative price. On one axis of Figure 5A-1 we show the country's exports (Qc — Dc), on the other its imports (DF — QF). Point T in Figure 5A-1 corresponds to the situation shown in Figure 5-3 (production at Q, consumption at D). Since (5A-1)

(DF - QF) = (Qc - Dc) X (PCJPF),

the slope of the line from the origin of Figure 5A-1 to T is equal to PCIPF. T is Home's offer at the assumed relative price: At that price, Home residents are willing to trade (Qc — Dc) units of cloth for (DF — QF) units of food.

Figure 5A-1 Home's Desired Trade at a Given Relative Price At the relative price corresponding to the slope of the line from the

Home's imports, D F - QF

origin, Home makes the offer to trade Q c — Dc units of cloth for DF — Q f units of food. Desired imports of food

Desired Home's exports exports, of cloth

Qc-Dc

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Figure 5A-2 [ Homers Offer Curve ' """ The offer curve is generated by tracing out how Home's offer varies as the

Home's imports, Df-

QF

relative price of cloth is changed.

O

Home's exports, Qc-Dc

By calculating Home's offer at different relative prices, we trace out Home's offer curve (Figure 5A-2). We saw in Figure 5-4 that as PCIPF rises, Qc rises, QF falls, DF rises, and Dc may rise or fall. Desired (Qc — Dc) and (DF — QF), however, both normally rise if income effects are not too strong. In Figure 5A-2, P is the offer corresponding to Q\ D1 in Figure 5-4; T2 the offer corresponding to Q2, D2. By finding Home's offer at many prices we trace out the Home offer curve OC. Foreign's offer curve OF may be traced out in the same way (Figure 5A-3). On the vertical axis we plot (Qf — Df), Foreign's desired exports of food, while on the horizontal axis we plot (D* — Q*), desired imports of cloth. The lower PC/PF is, the more food Foreign will want to export and the more cloth it will want to import. International Equilibrium In equilibrium it must be true that (Qc — Dc) = (D* — Q*), and also that (DF — QF) = (Q* — Df). That is, world supply and demand must be equal for both cloth and food. Given these equivalences, we can plot the Home and Foreign offer curves on the same diagram (Figure 5A-4). Equilibrium is at the point where the Home and Foreign offer curves cross. At the equilibrium point E the relative price of cloth is equal to the slope of OE. Home's exports of cloth, which equal Foreign's imports, are OX. Foreign's exports of food, which equal Home's imports, are OY. This representation of international equilibrium helps us see that equilibrium is in fact general equilibrium, in which supply and demand are equalized in both markets at the same time.

*

CHAPTER 5

The Standard Trade Model

Figure $A~$ I Foreign's Offer Curve Foreign's offer curve shows how that country's desired imports of cloth and

Foreign's exports, O*

exports of food vary with the relative price.

0

Foreign's imports, D

Figure 5 A-4 I Offer Curve Equilibrium World equilibrium is where the Home and Foreign offer curves intersect.

Home's imports of food, DF-QF Foreign's exports of food, O ^ - D

Home's exports of cloth, Qc - Dc Foreign's imports of cloth, C £ - Q

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6

Economies of Scale, Imperfect Competition, and International Trade

I

n Chapter 2 we pointed out that there are two reasons why countries specialize and trade. First, countries differ either in their resources or in technology and specialize in the things they do relatively well; second, economies of scale (or increasing returns) make it advantageous for each country to specialize in the production of only a limited range of goods and services.The past four chapters considered models in which all trade is based on comparative advantage; that is, differences between countries are the only reason for trade. This chapter introduces the role of economies of scale. The analysis of trade based on economies of scale presents certain problems that we have so far avoided. Up to now we have assumed that markets are perfectly competitive, so that all monopoly profits are always competed away. When there are increasing returns, however, large firms usually have an advantage over small, so that markets tend to be dominated by one firm (monopoly) or, more often, by a few firms (oligopoly). When increasing returns enter the trade picture, then, markets usually become imperfectly competitive. This chapter begins with an overview of the concept of economies of scale and the economics of imperfect competition. We then turn t o t w o models of international trade in which economies of scale and imperfect competition play a crucial role: the monopolistic competition model and the dumping model. The rest of the chapter addresses the role of a different kind of increasing returns, external economies, in determining trade patterns. •

:onomies of Scale and International Trade: An Overview The models of comparative advantage already presented were based on the assumption of constant returns to scale. That is, we assumed that if inputs to an industry were doubled, industry output would double as well. In practice, however, many industries are characterized by economies of scale (also referred to as increasing returns), so that production is more efficient the larger the scale at which it takes place. Where there are economies of scale, doubling the inputs to an industry will more than double the industry's production. A simple example can help convey the significance of economies of scale for international trade. Table 6-1 shows the relationship between input and output of a hypothetical 120

CHAPTER 6 Table 6-1

Economies of Scale, Imperfect Competition, and International Trade Relationship of Input to Output for a Hypothetical Industry

Output

Total Labor Input

Average Labor Input

5 10 15 20

10 15 20 25

2 1.5 1.333333 1.25

25 30

30 35

1.2 1.166667

industry. Widgets are produced using only one input, labor; the table shows how the amount of labor required depends on the number of widgets produced. To produce 10 widgets, for example, requires 15 hours of labor, while to produce 25 widgets requires 30 hours. The presence of economies of scale may be seen from the fact that doubling the input of labor from 15 to 30 more than doubles the industry's output—in fact, output increases by a factor of 2.5. Equivalently, the existence of economies of scale may be seen by looking at the average amount of labor used to produce each unit of output: If output is only 5 widgets the average labor input per widget is 2 hours, while if output is 25 units the average labor input falls to 1.2 hours. We can use this example to see why economies of scale provide an incentive for international trade. Imagine a world consisting of two countries, America and Britain, both of whom have the same technology for producing widgets, and suppose that initially each country produces 10 widgets. According to the table this requires 15 hours of labor in each country, so in the world as a whole 30 hours of labor produce 20 widgets. But now suppose that we concentrate world production of widgets in one country, say America, and let America employ 30 hours of labor in the widget industry. In a single country these 30 hours of labor can produce 25 widgets. So by concentrating production of widgets in America, the world economy can use the same amount of labor to produce 25 percent more widgets. But where does America find the extra labor to produce widgets, and what happens to the labor that was employed in the British widget industry? To get the labor to expand its production of some goods, America must decrease or abandon the production of others; these goods will then be produced in Britain instead, using the labor formerly employed in the industries whose production has expanded in America. Imagine that there are many goods subject to economies of scale in production, and give them numbers: 1, 2, 3 , . . . . To take advantage of economies of scale, each of the countries must concentrate on producing only a limited number of goods. Thus, for example, America might produce goods 1,3,5, and so on while Britain produces 2,4, 6, and so on. If each country produces only some of the goods, then each good can be produced at a larger scale than would be the case if each country tried to produce everything, and the world economy can therefore produce more of each good. How does international trade enter the story? Consumers in each country will still want to consume a variety of goods. Suppose that industry 1 ends up in America and industry 2 in Britain; then American consumers of good 2 will have to buy goods imported from

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Britain, while British consumers of good 1 will have to import it from America. International trade plays a crucial role: It makes it possible for each country to produce a restricted range of goods and to take advantage of economies of scale without sacrificing variety in consumption. Indeed, as we will see below, international trade typically leads to an increase in the variety of goods available. Our example, then, suggests how mutually beneficial trade can arise as a result of economies of scale. Each country specializes in producing a limited range of products, which enables it to produce these goods more efficiently than if it tried to produce everything for itself; these specialized economies then trade with each other to be able to consume the full range of goods. Unfortunately, to go from this suggestive story to an explicit model of trade based on economies of scale is not that simple. The reason is that economies of scale typically lead to a market structure other than that of perfect competition, and it is necessary to be careful about analyzing this market structure.

onomies of Scale and Market Structure In the example in Table 6-1, we represented economies of scale by assuming that the labor input per unit of production is smaller the more units produced. We did not say how this production increase was achieved—whether existing firms simply produced more, or whether there was instead an increase in the number of firms. To analyze the effects of economies of scale on market structure, however, one must be clear about what kind of production increase is necessary to reduce average cost. External economies of scale occur when the cost per unit depends on the size of the industry but not necessarily on the size of any one firm. Internal economies of scale occur when the cost per unit depends on the size of an individual firm but not necessarily on that of the industry. The distinction between external and internal economies can be illustrated with a hypothetical example. Imagine an industry that initially consists often firms, each producing 100 widgets, for a total industry production of 1000 widgets. Now consider two cases. First, suppose the industry were to double in size, so that it now consists of 20 firms, each one still producing 100 widgets. It is possible that the costs of each firm will fall as a result of the increased size of the industry; for example, a bigger industry may allow more efficient provision of specialized services or machinery. If this is the case, the industry exhibits external economies of scale. That is, the efficiency of firms is increased by having a larger industry, even though each firm is the same size as before. Second, suppose the industry's output were held constant at 1000 widgets, but that the number of firms is cut in half so that each of the remaining five firms produces 200 widgets. If the costs of production fall in this case, then there are internal economies of scale: A firm is more efficient if its output is larger. External and internal economies of scale have different implications for the structure of industries. An industry where economies of scale are purely external (that is, where there are no advantages to large firms) will typically consist of many small firms and be perfectly competitive. Internal economies of scale, by contrast, give large firms a cost advantage over small and lead to an imperfectly competitive market structure.

CHAPTER 6

Economies of Scale, Imperfect Competition, and International Trade

Both external and internal economies of scale are important causes of international trade. Because they have different implications for market structure, however, it is difficult to discuss both types of scale economy-based trade in the same model. We will therefore deal with them one at a time. We begin with a model based on internal economies of scale. As we have just argued, however, internal economies of scale lead to a breakdown of perfect competition. This outcome forces us to take time out to review the economics of imperfect competition before we can turn to the analysis of the role of internal economies of scale in international trade.

• p h e Theory of Imperfect Competition In a perfectly competitive market—a market in which there are many buyers and sellers, none of whom represents a large part of the market—firms are price takers. That is, sellers of products believe that they can sell as much as they like at the current price and cannot influence the price they receive for their product. For example, a wheat farmer can sell as much wheat as she likes without worrying that if she tries to sell more wheat she will depress the market price. The reason she need not worry about the effect of her sales on prices is that any individual wheat grower represents only a tiny fraction of the world market. When only a few firms produce a good, however, matters are different. To take perhaps the most dramatic example, the aircraft manufacturing giant Boeing shares the market for large jet aircraft with only one major rival, the European firm Airbus. Boeing therefore knows that if it produces more aircraft it will have a significant effect on the total supply of planes in the world and will therefore significantly drive down the price of airplanes. Or to put it the other way around, Boeing knows that if it wants to sell more airplanes, it can do so only by significantly reducing its price. In imperfect competition, then, firms are aware that they can influence the prices of their products and that they can sell more only by reducing their price. Imperfect competition is characteristic both of industries in which there are only a few major producers and of industries in which each producer's product is seen by consumers as strongly differentiated from those of rival firms. Under these circumstances each firm views itself as a. price setter, choosing the price of its product, rather than a price taker. When firms are not price takers, it is necessary to develop additional tools to describe how prices and outputs are determined. The simplest imperfectly competitive market structure to examine is that of a pure monopoly, a market in which a firm faces no competition; the tools we develop can then be used to examine more complex market structures.

Monopoly: A Brief Review Figure 6-1 shows the position of a single, monopolistic firm. The firm faces a downwardsloping demand curve, shown in the figure as D. The downward slope of D indicates that the firm can sell more units of output only if the price of the output falls. As you may recall from basic microeconomics, a marginal revenue curve corresponds to the demand curve. Marginal revenue is the extra or marginal revenue the firm gains from selling an

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Figure 6-1 Monopolistic Pricing and Production Decisions A monopolistic firm chooses an output at which marginal revenue, the

Cost, Cand Price, P

increase in revenue from selling an additional unit, equals marginal cost, the cost of producing an additional unit.This profit-maximizing output is shown as QM; the price at which this

Monopoly profits

output is demanded is PM. The marginal revenue curve AIR lies below the

AC

demand curve D, because, for a monopoly, marginal revenue is always less than the price. The monopoly's profits are equal to the area of the shaded rectangle, the difference between price and average cost times QM.

Quantity, Q

additional unit. Marginal revenue for a monopolist is always less than the price because to sell an additional unit the firm must lower the price of all units (not just the marginal one). Thus for a monopolist the marginal revenue curve, MR, always lies below the demand curve. Marginal Revenue and Price. For our analysis of the monopolistic competition model later in this section it is important to determine the relationship between the price the monopolist receives per unit and marginal revenue. Marginal revenue is always less than the price—but how much less? The relationship between marginal revenue and price depends on two things. First, it depends on how much output the firm is already selling: A firm that is not selling very many units will not lose much by cutting the price it receives on those units. Second, the gap between price and marginal revenue depends on the slope of the demand curve, which tells us how much the monopolist has to cut his price to sell one more unit of output. If the curve is very flat, then the monopolist can sell an additional unit with only a small price cut and will therefore not have to lower the price on units he would have sold otherwise by very much, so marginal revenue will be close to the price per unit. On the other hand, if the demand curve is very steep, selling an additional unit will require a large price cut, implying marginal revenue much less than price. We can be more specific about the relationship between price and marginal revenue if we assume that the demand curve the firm faces is a straight line. When this is so, the dependence of the monopolist's total sales on the price it charges can be represented by an equation of the form Q = A - B X P,

(6-1)

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where Q is the number of units the firm sells, P the price it charges per unit, and A and B are constants. We show in the appendix to this chapter that in this case marginal revenue is Marginal revenue = MR = P - Q/B,

(6-2)

implying P - MR = Q/B. Equation (6-2) reveals that the gap between price and marginal revenue depends on the initial sales Q of the firm and the slope parameter B of its demand curve. If sales quantity, Q, is higher, marginal revenue is lower, because the decrease in price required to sell a greater quantity costs the firm more. The greater is B, that is. the more sales fall for any given increase in price and the closer marginal revenue is to the price of the good. Equation (6-2) is crucial for our analysis of the monopolistic competition model of trade (pp. 132-150). Average and Marginal Costs. Returning to Figure 6-1, AC represents the firm's average cost of production, that is, its total cost divided by its output. The downward slope reflects our assumption that there are economies of scale, so that the larger the firm's output is the lower are its costs per unit. MC represents the firm's marginal cost (the amount it costs the firm to produce one extra unit). We know from basic economics that when average costs are a decreasing function of output, marginal cost is always less than average cost. Thus MC lies below AC. Equation (6-2) related price and marginal revenue. There is a corresponding formula relating average and marginal cost. Suppose the costs of a firm, C, take the form C = F + cXQ,

(6-3)

where F is a fixed cost that is independent of the firm's output, c is the firm's marginal cost, and Q is once again the firm's output. (This is called a linear cost function.) The fixed cost in a linear cost function gives rise to economies of scale, because the larger the firm's output, the less is the fixed cost per unit. Specifically, the firm's average cost (total cost divided by output) is Average cost = AC = CIQ = FIQ + c.

(6-4)

This average cost declines as Q increases because the fixed cost is spread over a larger output. If, for example, F = 5 and c = 1 the average cost of producing 10 units is 5/10 + 1 = 1.5 and the average cost of producing 25 units is 5/25 + 1 = 1.2. These numbers may look familiar, because they were used to construct Table 6-1. The relationship between output, average costs, and marginal costs given in Table 6-1 is shown graphically in Figure 6-2. Average cost approaches infinity at zero output and approaches marginal cost at very large output. The profit-maximizing output of a monopolist is that at which marginal revenue (the revenue gained from selling an extra unit) equals marginal cost (the cost of producing an

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Figure 6-2 Average Versus Marginal Cost This figure illustrates the average and marginal costs corresponding to the total cost function C = 5 + x. Marginal cost is always I; average cost declines as output rises.

Cost per unit 6 ni 5 4 3 2 -

Average cost

1

Marginal cost 2

4

6

8

10 12 14 16 18 20 22 24 Output

extra unit), that is, at the intersection of the MC and MR curves. In Figure 6-1 we can see that the price at which the profit-maximizing output QM is demanded is PM, which is greater than average cost. When P > AC, the monopolist is earning some monopoly profits.1 Monopolistic Competition

Monopoly profits rarely go uncontested. A firm making high profits normally attracts competitors. Thus situations of pure monopoly are rare in practice. Instead, the usual market structure in industries characterized by internal economies of scale is one of oligopoly: several firms, each of them large enough to affect prices, but none with an uncontested monopoly. The general analysis of oligopoly is a complex and controversial subject because in oligopolies the pricing policies of firms are interdependent. Each firm in an oligopoly will, in setting its price, consider not only the responses of consumers but also the expected responses of competitors. These responses, however, depend in turn on the competitors' expectations about the firm's behavior—and we are therefore in a complex game in which firms are trying to second-guess each others' strategies. We will briefly discuss the general problems of modeling oligopoly below. However, there is a special case of oligopoly, known as monopolistic competition, which is relatively easy to analyze. Since 1980 monopolistic competition models have been widely applied to international trade. In monopolistic competition models two key assumptions are made to get around the problem of interdependence. First, each firm is assumed to be able to differentiate its

'The economic definition of profits is not the same as that used in conventional accounting, where any revenue over and above labor and material costs is called a profit. A firm that earns a rate of return on its capital less than what that capital could have earned in other industries is not making profits; from an economic point of view the normal rate of return on capital represents part of the firm's costs, and only returns over and above that normal rate of return represent profits.

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product from that of its rivals. That is, because they want to buy this firm's particular product, the firm's customers will not rush to buy other firms' products because of a slight price difference. Product differentiation assures that each firm has a monopoly in its particular product within an industry and is therefore somewhat insulated from competition. Second, each firm is assumed to take the prices charged by its rivals as given—that is, it ignores the impact of its own price on the prices of other firms. As a result, the monopolistic competition model assumes that even though each firm is in reality facing competition from other firms, it behaves as if it were a monopolist—hence the model's name. Are there any monopolistically competitive industries in the real world? Some industries may be reasonable approximations. For example, the automobile industry in Europe, where a number of major producers (Ford, General Motors, Volkswagen, Renault, Peugeot, Fiat, Volvo—and more recently Nissan) offer substantially different yet nonetheless competing automobiles, may be fairly well described by monopolistically competitive assumptions. The main appeal of the monopolistic competition model is not, however, its realism, but its simplicity. As we will see in the next section of this chapter, the monopolistic competition model gives us a very clear view of how economies of scale can give rise to mutually beneficial trade. Before we can examine trade, however, we need to develop a basic model of monopolistic competition. Let us therefore imagine an industry consisting of a number of firms. These firms produce differentiated products, that is, goods that are not exactly the same but that are substitutes for one another. Each firm is therefore a monopolist in the sense that it is the only firm producing its particular good, but the demand for its good depends on the number of other similar products available and on the prices of other firms in the industry. Assumptions of t h e Model. We begin by describing the demand facing a typical monopolistically competitive firm. In general, we would expect a firm to sell more the larger the total demand for its industry's product and the higher the prices charged by its rivals. On the other hand, we expect the firm to sell less the greater the number of firms in the industry and the higher its own price. A particular equation for the demand facing a firm that has these properties is2 Q = S X [ V n- b X ( P -

P)l

(6-5)

where Q is the firm's sales, S is the total sales of the industry, n the number of firms in the industry, b a constant term representing the responsiveness of a firm's sales to its price, P the price charged by the firm itself, and P the average price charged by its competitors. Equation (6-5) may be given the following intuitive justification: If all firms charge the same price, each will have a market share Vn. A firm charging more than the average of other firms will have a smaller market share, a firm charging less a larger share.3 It is helpful to assume that total industry sales S are unaffected by the average price P charged by firms in the industry. That is, we assume that firms can gain customers only at

2

Equation (6-5) can be derived from a model in which consumers have different preferences and firms produce varieties tailored to particular segments of the market. See Stephen Salop, "Monopolistic Competition with Outside Goods," Bell Journal of Economics 10 (1979), pp. 141-156 for a development of this approach.

3

Equation (6-5) may be rewritten as Q = Sin - S X b X (P - P). If P = P, this reduces to Q = Sin. If P > P, Q < Sin, while if P < P, Q > Sin.

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each others' expense. This is an unrealistic assumption, but it simplifies the analysis and helps focus on the competition among firms. In particular, it means that S is a measure of the size of the market and that if all firms charge the same price, each sells Sin units. Next we turn to the costs of a typical firm. Here we simply assume that total and average costs of a typical firm are described by equations (6-3) and (6-4). Market Equilibrium. To model the behavior of this monopolistically competitive industry, we will assume that all firms in this industry are symmetric, that is, the demand function and cost function are identical for all firms (even though they are producing and selling somewhat differentiated products). When the individual firms are symmetric, the state of the industry can be described without enumerating the features of all firms in detail: All we really need to know to describe the industry is how many firms there are and what price the typical firm charges. To analyze the industry, for example to assess the effects of international trade, we need to determine the number of firms n and the average price they charge P. Once we have a method for determining n and P, we can ask how they are affected by international trade. Our method for determining n and P involves three steps. (1) First, we derive a relationship between the number of firms and the average cost of a typical firm. We show that this relationship is upward sloping; that is, the more firms there are, the lower the output of each firm, and thus the higher its cost per unit of output. (2) We next show the relationship between the number of firms and the price each firm charges, which must equal P in equilibrium. We show that this relationship is downward sloping: the more firms there are, the more intense is competition among firms, and as a result the lower the prices they charge. (3) Finally, we argue that when the price exceeds average cost additional firms will enter the industry, while when the price is less than average cost firms will exit. So in the long run the number of firms is determined by the intersection of the curve that relates average cost to n and the curve that relates price to n. 1. The number of firms and average cost. As a first step toward determining n and P, we ask how the average cost of a typical firm depends on the number of firms in the industry. Since all firms are symmetric in this model, in equilibrium they will all charge the same price. But when all firms charge the same price, so that P = P, equation (6-5) tells us that Q = Sin; that is, each firm's output Q, is a Vn share of the total industry sales S. But we saw in equation (6-4) that average cost depends inversely on a firm's output. We therefore conclude that average cost depends on the size of the market and the number of firms in the industry: AC = FIQ + c = n X F/S + c.

(6-6)

Equation (6-6) tells us that other things equal, the more firms there are in the industry the higher is average cost. The reason is that the more firms there are, the less each firm produces. For example, imagine an industry with total sales of 1 million widgets annually. If there are five firms in the industry, each will sell 200,000 annually. If there are ten firms, each will sell only 100,000, and therefore each firm will have higher average cost. The upward-sloping relationship between n and average cost is shown as CC in Figure 6-3.

CHAPTER 6 » ; , . : • • • : .

: , • , > " •

Economies of Scale, Imperfect Competition, and International Trade

•

Figure 6-3 Equilibrium m'a Monopbiisticaily Competitive Market Cost C, and Price, P

AC3~

y

\ \

CC

/

r

P2,AC2-

r

\s

r

• PP

i

Number of lirms, n The number of firms in a monopolistically competitive market, and the prices they charge, are determined by two relationships. On one side, the more firms there are, the more intensely they compete, and hence the lower is the industry price.This relationship is represented by PR On the other side, the more firms there are, the less each firm sells and therefore the higher is its average cost. This relationship is represented by CC. If price exceeds average cost (if the PP curve is above the CC curve), the industry will be making profits and additional firms will enter the industry; if price is less than average cost, the industry will be incurring losses and firms will leave the industry. The equilibrium price and number of firms occurs when price equals average cost, at the intersection of PP and CC.

2. The number affirms and the price. Meanwhile, the price the typical firm charges also depends on the number of firms in the industry. In general, we would expect that the more firms there are, the more intense will be the competition among them, and hence the lower the price. This turns out to be true in this model, but proving it takes a moment. The basic trick is to show that each firm faces a straight-line demand curve of the form we showed in equation (6-1), and then to use equation (6-2) to determine prices. First recall that in the monopolistic competition model firms are assumed to take each others' prices as given; that is, each firm ignores the possibility that if it changes its price other firms will also change theirs. If each firm treats P as given, we can rewrite the demand curve (6-5) in the form Q = {Sin + S X b X P) ~ S X b X P,

(6-7)

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where b is the parameter in equation (6-5) that measured the sensitivity of each firm's market share to the price it charges. Now this is in the same form as (6-1), with Sin + S X b X P in place of the constant term A and 5 X b in place of the slope coefficient B. If we plug these values back into the formula for marginal revenue (6-2), we have a marginal revenue for a typical firm of MR = P - Q/(S X b).

(6-8)

Profit-maximizing firms will set marginal revenue equal to their marginal cost c, so that MR = P - QI{S Xb) = c, which can be rearranged to give the following equation for the price charged by a typical firm: P = c + QI{S X b).

(6-9)

We have already noted, however, that if all firms charge the same price, each will sell an amount Q = Sfn. Plugging this back into (6-9) gives us a relationship between the number of firms and the price each firm charges: P = c + \l{bXn).

(6-10)

Equation (6-10) says algebraically that the more firms there are in the industry, the lower the price each firm will charge. Equation (6-10) is shown in Figure 6-3 as the downward-sloping curve PP. 3. The equilibrium number of firms. Let us now ask what Figure 6-3 means. We have summarized an industry by two curves. The downward-sloping curve PP shows that the more firms there are in the industry, the lower the price each firm will charge. This makes sense: The more firms there are, the more competition each firm faces. The upward-sloping curve CC tells us that the more firms there are in the industry, the higher the average cost of each firm. This also makes sense: If the number of firms increases, each firm will sell less, so firms will not be able to move as far down their average cost curve. The two schedules intersect at point E, corresponding to the number of firms nT The significance of n2 is that it is the zero-profit number of firms in the industry. When there are n2 firms in the industry, their profit-maximizing price is P2, which is exactly equal to their average cost AC2. What we will now argue is that in the long run the number of firms in the industry tends to move toward #,, so that point E describes the industry's long-run equilibrium. To see why, suppose that n were less than «2, say nv Then the price charged by firms would be Pv while their average cost would be only ACV Thus firms would be making monopoly profits. Conversely, suppose that n were greater than n2, say nv Then firms

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Economies of Scale, Imperfect Competition, and International Trade

would charge only the price Pv while their average cost would be ACy Firms would be suffering losses. Over time, firms will enter an industry that is profitable, exit one in which they lose money. The number of firms will rise over time if it is less than n2, fall if it is greater. This means that n2 is the equilibrium number of firms in the industry and P2 the equilibrium price.4 We have now developed a model of a monopolistically competitive industry in which we can determine the equilibrium number of firms and the average price that firms charge. We can use this model to derive some important conclusions about the role of economies of scale in international trade. But before we do, we should take a moment to note some limitations of the monopolistic competition model. Limitations of the Monopolistic Competition Model The monopolistic competition model captures certain key elements of markets where there are economies of scale and thus imperfect competition. However, few industries are well described by monopolistic competition. Instead, the most common market structure is one of small-group oligopoly, where only a few firms are actively engaged in competition. In this situation the key assumption of the monopolistic competition model, which is that each firm will behave as if it were a true monopolist, is likely to break down. Instead, firms will be aware that their actions influence the actions of other firms and will take this interdependence into account. Two kinds of behavior arise in the general oligopoly setting that are excluded by assumption from the monopolistic competition model. The first is collusive behavior. Each firm may keep its price higher than the apparent profit-maximizing level as part of an understanding that other firms will do the same; since each firm's profits are higher if its competitors charge high prices, such an understanding can raise the profits of all the firms (at the expense of consumers). Collusive price-setting behavior may be managed through explicit agreements (illegal in the United States) or through tacit coordination strategies, such as allowing one firm to act as a price leader for the industry. Firms may also engage in strategic behavior; that is, they may do things that seem to lower profits, but that affect the behavior of competitors in a desirable way. For example a firm may build extra capacity not to use it but to deter potential rivals from entering its industry. These possibilities for both collusive and strategic behavior make the analysis of oligopoly a complex matter. There is no one generally accepted model of oligopoly behavior, which makes modeling trade in monopolistic industries problematic. The monopolistic competition approach to trade is attractive because it avoids these complexities. Even though it may leave out some features of the real world, the monopolistic competition model is widely accepted as a way to provide at least a first cut at the role of economies of scale in international trade.

4

This analysis slips past a slight problem: The number of firms in an industry must, of course be a whole number like 5 or 8. What if n2 turns out to equal 6.37? The answer is that there will be 6 firms in the industry, all making small monopoly profits, but not challenged by new entrants because everyone knows that a seven-firm industry would lose money. In most examples of monopolistic competition, this whole-number or "integer constraint" problem turns out not to be very important, and we ignore it here.

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onopolistic Competition and Trade Underlying the application of the monopolistic competition model to trade is the idea that trade increases market size. In industries where there are economies of scale, both the variety of goods that a country can produce and the scale of its production are constrained by the size of the market. By trading with each other, and therefore forming an integrated world market that is bigger than any individual national market, nations are able to loosen these constraints. Each country can specialize in producing a narrower range of products than it would in the absence of trade; yet by buying goods that it does not make from other countries, each nation can simultaneously increase the variety of goods available to its consumers. As a result, trade offers an opportunity for mutual gain even when countries do not differ in their resources or technology. Suppose, for example, that there are two countries, each with an annual market for 1 million automobiles. By trading with each other, these countries can create a combined market of 2 million autos. In this combined market, more varieties of automobiles can be produced, at lower average costs, than in either market alone. The monopolistic competition model can be used to show how trade improves the tradeoff between scale and variety that individual nations face. We will begin by showing how a larger market leads, in the monopolistic competition model, to both a lower average price and the availability of a greater variety of goods. Applying this result to international trade, we observe that trade creates a world market larger than any of the national markets that comprise it. Integrating markets through international trade therefore has the same effects as growth of a market within a single country. The Effects of Increased Market Size The number of firms in a monopolistically competitive industry and the prices they charge are affected by the size of the market. In larger markets there usually will be both more firms and more sales per firm; consumers in a large market will be offered both lower prices and a greater variety of products than consumers in small markets. To see this in the context of our model, look again at the CC curve in Figure 6-3, which showed that average costs per firm are higher the more firms there are in the industry. The definition of the CC curve is given by equation (6-6): AC = FIQ + c = n X F/S + c. Examining this equation, we see that an increase in total sales 5 will reduce average costs for any given number of firms n. The reason is that if the market grows while the number of firms is held constant, sales per firm will increase and the average cost of each firm will therefore decline. Thus if we compare two markets, one with higher 5 than the other, the CC curve in the larger market will be below that in the smaller one. Meanwhile, the PP curve in Figure 6-3, which relates the price charged by firms to the number of firms, does not shift. The definition of that curve is given in equation (6-10):

P = c+ \l{b X n). The size of the market does not enter into this equation, so an increase in S does not shift the PP curve.

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133

Figure 6-4 Effects of a Larger Market An increase in the size of the market allows

Cost, Cand Price, P

each firm, other things equal, to produce more and thus have lower average cost. This is represented by a downward shift from CCt to CC2.The result is a simultaneous increase in the number of firms (and hence in the variety of goods available) and fall in the price of each.

Number of firms, n

Figure 6-4 uses this information to show the effect of an increase in the size of the market on long-run equilibrium. Initially, equilibrium is at point 1, with a price f, and a number of firms nv An increase in the size of the market, measured by industry sales S, shifts the CC curve down from CC} to CC2, while it has no effect on the PP curve. The new equilibrium is at point 2: The number of firms increases from n] to nv while the price falls from P, to P2. Clearly, consumers would prefer to be part of a large market rather than a small one. At point 2, a greater variety of products is available at a lower price than at point 1. Gains from an Integrated Market: A Numerical Example International trade can create a larger market. We can illustrate the effects of trade on prices, scale, and the variety of goods available with a specific numerical example. Imagine that automobiles are produced by a monopolistically competitive industry. The demand curve facing any given producer of automobiles is described by equation (6-5), with b = 1/30,000 (this value has no particular significance; it was chosen to make the example come out neatly). Thus the demand facing any one producer is given by Q = S X [1/n - (1/30,000) X (P - P)], where Q is the number of automobiles sold per firm, S the total sales of the industry, n the number of firms, P the price that a firm charges, and P the average price of other firms. We

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also assume that the cost function for producing automobiles is described by equation (6-3), with a fixed cost F = $750,000,000 and a marginal cost c = $5000 per automobile (again these values are chosen to give nice results). The total cost is C = 750,000,000 + (5000 X Q). The average cost curve is therefore AC = (750,000,000/0 + 5000. Now suppose there are two countries, Home and Foreign. Home has annual sales of 900,000 automobiles; Foreign has annual sales of 1.6 million. The two countries are assumed, for the moment, to have the same costs of production. Figure 6-5a shows the PP and CC curves for the Home auto industry. We find that in the absence of trade, Home would have six automobile firms, selling at a price of $10,000 each. (It is also possible to solve for n and P algebraically, as shown in the Mathematical Postscript to this chapter.) To confirm that this is the long-run equilibrium, we need to show both, that the pricing equation (6-10) is satisfied and that the price equals average cost. Substituting the actual values of the marginal cost c, the demand parameter b, and the number of Home firms n into equation (6-10), we find P = $10,000 = c + \l(b Xn) = $5000 + l/[( 1/30,000) X 6] = $5000 + $5000, so the condition for profit maximization—that marginal revenue equal marginal cost—is satisfied. Each firm sells 900,000 units/6 firms = 150,000 units/firm. Its average cost is therefore AC = ($750,000,000/150,000) + $5000 = $10,000. Since the average cost of $10,000 per unit is the same as the price, all monopoly profits have been competed away. Thus six firms, selling at a price of $10,000, with each firm producing 150,000 cars, is the long-run equilibrium in the Home market. What about Foreign? By drawing the PP and CC curves (panel (b) in Figure 6-5) we find that when the market is for 1.6 million automobiles, the curves intersect at n = 8, P = 8750. That is, in the absence of trade Foreign's market would support eight firms, each producing 200,000 automobiles, and selling them at a price of $8750. We can again confirm that this solution satisfies the equilibrium conditions: P = $8750 = c + \J(b X n) = $5000 + l/[( 1/30,000) X 8] = $5000 + $3750, and AC = ($750,000,000/200,000) + $5000 = $8750. Now suppose it is possible for Home and Foreign to trade automobiles costlessly with one another. This creates a new, integrated market (panel (c) in Figure 6-5) with total sales of 2.5 million. By drawing the PP and CC curves one more time, we find that this integrated

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135

gure 6-5 I Equilibrium in the Automobile Market Price per auto, in thousands of dollars

10

Price per auto, in thousands of dollars

£

1

2

3

4

5

6

7

8

9

10 11 12

2

3

4

5

6

7

8

9

Number of firms, n (a) Home

Number of firms, n (b) Foreign

Price per auto, in thousands of dollars

CC

6

7

8

9

10 11 12 Number of firms, n

(c) Integrated (a) The Home market: With a market size of 900,000 automobiles, Home's equilibrium, determined by the intersection of the PP and CC curves, occurs with six firms and an industry price of $ 10,000 per auto, (b) The Foreign market: With a market size of 1.6 million automobiles, Foreign's equilibrium occurs with eight firms and an industry price of $8750 per car. (c) The combined market: Integrating the two markets creates a market for 2.5 million autos.This market supports ten firms,and the price of an auto is only $8000.

10 11 12

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market will support ten firms, each producing 250,000 cars and selling them at a price of $8000. The conditions for profit maximization and zero profits are again satisfied: P = $8000 = c + \/(bXn)

= $5000 + I/[(1/30,000) X 10] - $5000 + $3000,

and AC = ($750,000,000/250,000) + $5000 = $8000. We summarize the results of creating an integrated market in Table 6-2. The table compares each market alone with the integrated market. The integrated market supports more firms, each producing at a larger scale and selling at a lower price than either national market did on its own. Clearly everyone is better off as a result of integration. In the larger market, consumers have a wider range of choice, yet each firm produces more and is therefore able to offer its product at a lower price. To realize these gains from integration, the countries must engage in international trade: To achieve economies of scale, each firm must concentrate its production in one country— either Home or Foreign. Yet it must sell its output to customers in both markets. So each product will be produced in only one country and exported to the other. Economies of Scale and Comparative Advantage Our example of a monopolistically competitive industry says little about the pattern of trade that results from economies of scale. The model assumes that the cost of production is the same in both countries and that trade is costless. These assumptions mean that although we know that the integrated market will support ten firms, we cannot say where they will be located. For example, four firms might be in Home and six in Foreign—but it is equally possible, as far as this example goes, that all ten will be in Foreign (or in Home). To say more than that the market will support ten firms, it is necessary to go behind the partial equilibrium framework that we have considered so far and think about how economies of scale interact with comparative advantage to determine the pattern of international trade. Let us therefore now imagine a world economy consisting, as usual, of our two countries Home and Foreign. Each of these countries has two factors of production, capital and

T a b l e 6-2

Hypothetical Example of Gains from Market Integration

Home Market, before Trade Total sales of autos Number of firms Sales per firm Average cost Price

900,000 6 150,000 10,000 10,000

Foreign Market, before Trade 1,600,000 8 200,000 8,750 8,750

Integrated Market, after Trade 2,500,000 10 250,000 8,000 8,000

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labor. We assume that Home has a higher overall capital-labor ratio than Foreign, that is, that Home is the capital-abundant country. Let's also imagine that there are two industries, manufactures and food, with manufactures the more capital-intensive industry. The difference between this model and the factor proportions model of Chapter 4 is that we now suppose that manufactures is not a perfectly competitive industry producing a homogeneous product. Instead, it is a rnonopolistically competitive industry in which a number of firms all produce differentiated products. Because of economies of scale, neither country is able to produce the full range of manufactured products by itself; thus, although both countries may produce some manufactures, they will be producing different things. The monopolistically competitive nature of the manufactures industry makes an important difference to the trade pattern, a difference that can best be seen by looking at what would happen if manufactures were not a monopolistically competitive sector. If manufactures were not a differentiated product sector, we know from Chapter 4 what the trade pattern would look like. Because Home is capital-abundant and manufactures capital-intensive, Home would have a larger relative supply of manufactures and would therefore export manufactures and import food. Schematically, we can represent this trade pattern with a diagram like Figure 6-6. The length of the arrows indicates the value of trade in each direction; the figure shows that Home would export manufactures equal in value to the food it imports. If we assume that manufactures is a monopolistically competitive sector (each firm's products are differentiated from other firms'), Home will still be a net exporter of manufactures and an importer of food. However, Foreign firms in the manufactures sector will produce products different from those that Home firms produce. Because some Home consumers will prefer Foreign varieties, Home, although running a trade surplus in manufactures, will import as well as export within the manufacturing industry. With manufactures monopolistically competitive, then, the pattern of trade will look like Figure 6-7. We can think of world trade in a monopolistic competition model as consisting of two parts. There will be two-way trade within the manufacturing sector. This exchange of manufactures for manufactures is called intraindustry trade. The remainder of trade is an exchange of manufactures for food called interindustry trade.

igure 6-6 j 'lade m a VVuiiu W In a world without economies of scale, there would be a simple

Returns Home {capital abundant)

exchange of manufactures for food.

Foreign {labor abundant)

Manufactures

Food

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Figure 6-7

Trade with Increasing Returns and Monopolistic Competition

Home (capital abundant)

Manufactures

Food Interindustry trade

Intraindustry f trade Foreign {labor abundant)

If manufactures is a monopolistically competitive industry. Home and Foreign will produce differentiated products. As a result, even if Home is a net exporter of manufactured goods, it will import as well as export manufactures, giving rise to intraindustry trade.

Notice these four points about this pattern of trade: 1. Interindustry (manufactures for food) trade reflects comparative advantage. The pattern of interindustry trade is that Home, the capital-abundant country, is a net exporter of capital-intensive manufactures and a net importer of labor-intensive food. So comparative advantage continues to be a major part of the trade story. 2. Intraindustry trade (manufactures for manufactures) does not reflect comparative advantage. Even if the countries had the same overall capital-labor ratio, their firms would continue to produce differentiated products and the demand of consumers for products made abroad would continue to generate intraindustry trade. It is economies of scale that keep each country from producing the full range of products for itself; thus economies of scale can be an independent source of international trade. 3. The pattern of intraindustry trade itself is unpredictable. We have not said anything about which country produces which goods within the manufactures sector because there is nothing in the model to tell us. All we know is that the countries will produce different products. Since history and accident determine the details of the trade pattern, an unpredictable component of the trade pattern is an inevitable feature of a world where economies of scale are important. Notice, however, that the unpredictability is not total. While the precise pattern of intraindustry trade within the manufactures sector is arbitrary, the pattern of interindustry trade between manufactures and food is determined by underlying differences between countries. 4. The relative importance of intraindustry and interindustry trade depends on how similar countries are. If Home and Foreign are similar in their capital-labor ratios, then there will be little interindustry trade, and intraindustry trade, based ultimately on economies of scale, will be dominant. On the other hand, if the capital-labor ratios are very different, so that, for example, Foreign specializes completely in food production, there will be no intraindustry trade based on economies of scale. All trade will be based on comparative advantage.

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The Significance of Intraindustry Trade About one-fourth of world trade consists of intraindustry trade, that is, two-way exchanges of goods within standard industrial classifications. Intraindustry trade plays a particularly large role in the trade in manufactured goods among advanced industrial nations, which accounts for most of world trade. Over time, the industrial countries have become increasingly similar in their levels of technology and in the availability of capital and skilled labor. Since the major trading nations have become similar in technology and resources, there is often no clear comparative advantage within an industry, and much of international trade therefore takes the form of two-way exchanges within industries—probably driven in large part by economies of scale—rather than interindustry specialization driven by comparative advantage. Table 6-3 shows measures of the importance of intraindustry trade for a number of U.S. manufacturing industries in 1993. The measure shown is intraindustry trade/total trade.5 The measure ranges from 0.99 for inorganic chemicals—an industry in which U.S. exports and imports are nearly equal—to 0.00 for footwear, an industry in which the United States has large imports but virtually no exports. The measure would be zero for an industry in which the United States was only an exporter or only an importer, not both; it would be one in an industry for which U.S. exports exactly equaled U.S. imports. Table 6-3 shows that in many industries a large part of trade is intraindustry (closer to one) rather than interindustry (closer to zero). The industries are ranked by the relative importance of intraindustry trade, those with higher intraindustry trade first. Industries with high levels of intraindustry trade tend to be sophisticated manufactured goods, such as chemicals, pharmaceuticals, and power-generating equipment. These goods are exported principally by advanced nations and are probably subject to important economies of scale in production. At the other end of the scale, the industries with very little intraindustry trade are typically labor-intensive products, such as footwear and apparel. These are goods that the United States imports primarily from less developed countries, where comparative advantage is clear-cut and is the primary determinant of U.S. trade with these countries.6

5

To be more precise, the standard formula tor calculating the importance of intraindustry trade within a given industry is ~~

exports — importsl exports + imports

where the expression lexports — importsl means "absolute value of the trade balance": if exports are $100 million more than imports, the numerator of the fraction is 100, but if exports are $100 million less than imports, it is also 100. In comparative-advantage models of international trade, we expect a country either to export a good or to import it, not both; in that case / would always equal zero. On the other hand, if a country's exports and imports within an industry are equal, we find / = 1. 6

The growing trade between low-wage and high-wage nations sometimes produces trade that is classified as intraindustry even though it is really driven by comparative advantage. Suppose, for example, a U.S. company produces some sophisticated computer chips in California, ships them to Asia where they are assembled into a computer, and then ships that computer back home. Both the exported components and the imported computer are likely to be classified as being "computers and related devices," so that the transactions will be counted as intraindustry trade. Nonetheless, what is really going on is that the United States is exporting skill-intensive products (chips) and importing a labor-intensive service (computer assembly). Such "pseudo-intraindustry" trade is particularly common in trade between the United States and Mexico.

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T a b l e 6-3

Indexes of intraindustry Trade for US. Industries, 1993

Inorganic chemicals Power-generating machinery Electrical machinery Organic chemicals Medical and pharmaceutical Office machinery Telecommunications equipment Road vehicles Iron and steel Clothing and apparel Footwear

0.99 0.97 0.96 0.91 0.86 0.81 0.69 0.65 0.43 0.27 0.00

Why Intraindustry Trade Matters Table 6-3 shows that a sizeable part of international trade is intraindustry trade rather than the interindustry trade we studied in Chapters 2 through 5. But does the importance of intraindustry trade change any of our conclusions? First, intraindustry trade produces extra gains from international trade, over and above those from comparative advantage, because intraindustry trade allows countries to benefit from larger markets. As we have seen, by engaging in intraindustry trade a country can simultaneously reduce the number of products it produces and increase the variety of goods available to domestic consumers. By producing fewer varieties, a country can produce each at larger scale, with higher productivity and lower costs. At the same time, consumers benefit from the increased range of choice. In our numerical example of the gains from integrating a market, Home consumers found that intraindustry trade expanded their range of choice from six automobile models to ten even as it reduced the price of autos from $ 10,000 to $8000. As the case study of the North American auto industry indicates (p. 141), the advantages of creating an integrated industry in two countries can be substantial in reality as well. In our earlier analysis of the distribution of gains from trade (Chapters 3 and 4), we were pessimistic about the prospects that everyone will benefit from trade, even though international trade could potentially raise everyone's income. In the models discussed earlier, trade had all its effects through changes in relative prices, which in turn have very strong effects on the distribution of income. Suppose, however, that intraindustry trade is the dominant source of gains from trade. This will happen (1) when countries are similar in their relative factor supplies, so that there is not much interindustry trade, and (2) when scale economies and product differentiation are important, so that the gains from larger scale and increased choice are large. In these circumstances the income distribution effects of trade will be small and there will be substantial extra gains from intraindustry trade. The result may well be that despite the effects of trade on income distribution, everyone gains from trade. When will this be most likely to happen? Intraindustry trade tends to be prevalent between countries that are similar in their capital-labor ratios, skill levels, and so on. Thus, intraindustry trade will be dominant between countries at a similar level of economic development. Gains from this trade will be large when economies of scale are strong and

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products are highly differentiated. This is more characteristic of sophisticated manufactured goods than of raw materials or more traditional sectors (such as textiles or footwear). Trade without serious income distribution effects, then, is most likely to happen in manufactures trade between advanced industrial countries. This conclusion is borne out by postwar experience, particularly in Western Europe. In 1957 the major countries of continental Europe established a free trade area in manufactured goods, the Common Market, or European Economic Community (EEC). (The United Kingdom entered the EEC later, in 1973.) The result was a rapid growth of trade. Trade within the EEC grew twice as fast as world trade as a whole during the 1960s. One might have expected this rapid growth in trade to produce substantial dislocations and political problems. The growth in trade, however, was almost entirely intraindustry rather than interindustry; drastic economic dislocation did not occur. Instead of, say, workers in France's electrical machinery industry being hurt while those in Germany's gained, workers in both sectors gained from the increased efficiency of the integrated European industry. The result was that the growth in trade within Europe presented far fewer social and political problems than anyone anticipated. There is both a good and a bad side to this favorable view of intraindustry trade. The good side is that under some circumstances trade is relatively easy to live with and therefore relatively easy to support politically. The bad side is that trade between very different countries or where scale economies and product differentiation are not important remains politically problematic. In fact, the progressive liberalization of trade that characterized the 30-year period from 1950 to 1980 was primarily concentrated on trade in manufactures among the advanced nations, as we will see in Chapter 9. If progress on other kinds of trade is important, the past record does not give us much encouragement.

CASE STUDY Intraindustry Trade in Action: The North American Auto Pact of 1964 An unusually clear-cut example of the role of economies of scale in generating beneficial international trade is provided by the growth in automotive trade between the United States and Canada during the second half of the 1960s. While the case does not fit our model exactly, it does show that the basic concepts we have developed are useful in the real world. Before 1965, tariff protection by Canada and the United States produced a Canadian auto industry that was largely self-sufficient, neither importing nor exporting much. The Canadian industry was controlled by the same firms as the U.S. industry—a departure from our model, since we have not yet examined the role of multinational firms—but these firms found it cheaper to have largely separate production systems than to pay the tariffs. Thus the Canadian industry was in effect a miniature version of the U.S. industry, at about one-tenth the scale. The Canadian subsidiaries of U.S. firms found that small scale was a substantial disadvantage. This was partly because Canadian plants had to be smaller than their U.S. counterparts. Perhaps more important, U.S. plants could often be "dedicated"—that is, devoted to producing

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a single model or component—while Canadian plants had to produce several different things, requiring the plants to shut down periodically to change over from producing one item to producing another, to hold larger inventories, to use less specialized machinery, and so on. The Canadian auto industry had a labor productivity about 30 percent lower than that of the United States. In an effort to remove these problems, the United States and Canada agreed in 1964 to establish a free trade area in automobiles (subject to certain restrictions). This allowed the auto companies to reorganize their production. Canadian subsidiaries of the auto firms sharply cut the number of products made in Canada. For example, General Motors cut in half the number of models assembled in Canada. The overall level of Canadian production and employment was, however, maintained. This was achieved by importing from the United States products no longer made in Canada and exporting the products Canada continued to make. In 1962, Canada exported $16 million worth of automotive products to the United States while importing $519 million worth. By 1968 the numbers were $2.4 and $2.9 billion, respectively. In other words, both exports and imports increased sharply: intraindustry trade in action. The gains seem to have been substantial. By the early 1970s the Canadian industry was comparable to the U.S. industry in productivity.

umping The monopolistic competition model helps us understand how increasing returns promote international trade. As we noted earlier, however, this model assumes away many of the issues that can arise when firms are imperfectly competitive. Although it recognizes that imperfect competition is a necessary consequence of economies of scale, the monopolistic competition analysis does not focus on the possible consequences of imperfect competition itself for international trade. In reality, imperfect competition has some important consequences for international trade. The most striking of these is that firms do not necessarily charge the same price for goods that are exported and those that are sold to domestic buyers. The Economics of Dumping In imperfectly competitive markets, firms sometimes charge one price for a good when that good is exported and a different price for the same good when it is sold domestically. In general, the practice of charging different customers different prices is called price discrimination. The most common form of price discrimination in international trade is dumping, a pricing practice in which a firm charges a lower price for exported goods than it does for the same goods sold domestically. Dumping is a controversial issue in trade policy, where it is widely regarded as an "unfair" practice and is subject to special rules and penalties. We will discuss the policy dispute surrounding dumping in Chapter 9. For now, we present some basic economic analysis of the dumping phenomenon. Dumping can occur only if two conditions are met. First, the industry must be imperfectly competitive, so that firms set prices rather than taking market prices as given. Second, markets must be segmented, so that domestic residents cannot easily purchase goods intend-

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ed for export. Given these conditions, a monopolistic firm may find that it is profitable to engage in dumping. An example may help to show how dumping can be a profit-maximizing strategy. Imagine a firm that currently sells 1000 units of a good at home and 100 units abroad. Currently selling the good at $20 per unit domestically, it gets only $15 per unit on export sales. One might imagine that the firm would conclude that additional domestic sales are much more profitable than additional exports. Suppose, however, that to expand sales by one unit, in either market, would require reducing the price by $0.01. Reducing the domestic price by a penny, then, would increase sales by one unit—directly adding $19.99 in revenue, but reducing the receipts on the 1000 units that would have sold at the $20 price by $10. So the marginal revenue from the extra unit sold is only $9.99. On the other hand, reducing the price charged to foreign customers and thereby expanding exports by one unit would directly increase revenue by only $ 14.99. The indirect cost of reduced receipts on the 100 units that would have been sold at the original price, however, would be only $1, so that marginal revenue on export sales would be $13.99. It would therefore be more profitable in this case^to expand exports rather than domestic sales, even though the price received on exports is lower. This example could be reversed, with the incentive being to charge less on domestic than foreign sales. However, price discrimination in favor of exports is more common. Since international markets are imperfectly integrated due to both transportation costs and protectionist trade barriers, domestic firms usually have a larger share of home markets than they do of foreign markets. This in turn usually means that their foreign sales are more affected by their pricing than their domestic sales. A firm with a 20 percent market share need not cut its price as much to double its sales as a firm with an 80 percent share. So firms typically see themselves as having less monopoly power, and a greater incentive to keep their prices low, on exports than on domestic sales. Figure 6-8 offers a diagrammatic example of dumping. It shows an industry in which there is a single monopolistic domestic firm. The firm sells in two markets: a domestic market, where it faces the demand curve DDOM, and an export market. In the export market we take the assumption that sales are highly responsive to the price the firm charges to an extreme, assuming the firm can sell as much as it wants at the price PF0R. The horizontal line PFOK is thus the demand curve for sales in the foreign market. We assume the markets are segmented, so that the firm can charge a higher price for domestically sold goods than it does for exports. MC is the marginal cost curve for total output, which can be sold on either market. To maximize profits, the firm must set marginal revenue equal to marginal cost in each market. Marginal revenue on domestic sales is defined by the curve MRDOM, which lies below DDOM. Export sales take place at a constant price PF0R, so the marginal revenue for an additional unit exported is just PFOR. To set marginal cost equal to marginal revenue in both markets it is necessary to produce the quantity QMONOPOLY' t 0 s e ^ QDOM o n m e domestic market, and to export QMONOPOLY ~ QDOM-1 The c o s t of producing an additional unit in this

7

It might seem that the monopolist should set domestic sales at the level where MC and MRnoM intersect. But remember that the monopolist is producing a total output QMONOPOLY' t n ' s m e a n s that the cost of producing one more unit is equal to PF(m, whether that unit is destined for the foreign or domestic market. And it is the actual cost of producing one more unit that must be set equal to marginal revenue. The intersection of MC and MRlWM is where the firm would produce if it did not have the option of exporting—but that is irrelevant.

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Figure 6-8 Dumping Cost, C and Price, P

P

DOM

MC

D

FOR =

FOR

MR

FOR

Quantities produced and demanded, Q Domestic sales

Exports

Total output The figure shows a monopolist that faces a demand curve DD0M for domestic sales, but which can also sell as much as it likes at the export price PF0R. Since an additional unit can always be sold at Pf0R, the firm increases output until the marginal cost equals PF0R; this profit-maximizing output is shown as

QMONOPOLY- Since

the firm's marginal cost at

QMONOPOLY ' S ^OR'

'lt s e " s

out

Put

on

tne

domestic market up to the point where marginal revenue equals PFOfl,this profit-maximizing level of domestic sales is shown as QD0A1.The rest of its output, QM0N0P0LY ~~ Q-DOM'iS exported. The price at which domestic consumers demand QD0A1 is PDO/V1. Since PD0M > PF0R,the firm sells exports at a lower price than it charges domestic consumers.

case is equal to PFOR, the marginal revenue from exports, which in turn is equal to the marginal revenue for domestic sales. The quantity Qn0M will be demanded domestically at a price of PD0M, which is above the export price PFOR. Thus the firm is indeed dumping, selling more cheaply abroad than at home. In both our numerical example and Figure 6-8, the reason the firm chooses to dump is the difference in the responsiveness of sales to price in the export and domestic markets. In Figure 6-8 we assume the firm can increase exports without cutting its price, so marginal revenue and price coincide on the export market. Domestically, by contrast, increased sales do lower the price. This is an extreme example of the general condition for price discrimination presented in microeconomics courses: Firms will price-discriminate when sales are

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145

more price-responsive in one market than in another.s (In this case we have assumed export demand is infinitely price-responsive.) Dumping is widely regarded as an unfair practice in international trade. There is no good economic justification for regarding dumping as particularly harmful, but U.S. trade law prohibits foreign firms from dumping in our market and automatically imposes tariffs when such dumping is discovered. The situation shown in Figure 6-8 is simply an extreme version of a wider class of situations in which firms have an incentive to sell exports for a lower price than the price they charge domestic customers.

^^jjjjp CASE STUDY Antidumping as Protectionism In the United States and a number of other countries, dumping is regarded as an unfair competitive practice. Firms that claim to have been injured by foreign firms who dump their products in the domestic market at low prices can appeal, through a quasi-judicial procedure, to the Commerce Department for relief. If their complaint is ruled valid an "antidumping duty" is imposed, equal to the calculated difference between the actual and "fair" price of imports. In practice, the Commerce Department accepts the great majority of complaints by U.S. firms about unfair foreign pricing. The determination that this unfair pricing has actually caused injury, however, is in the hands of a different agency, the International Trade Commission, which rejects about half of its cases. Economists have never been very happy with the idea of singling dumping out as a prohibited practice. For one thing, price discrimination between markets may be a perfectly legitimate business strategy—like the discounts that airlines offer to students, senior citizens, and travelers who are willing to stay over a weekend. Also, the legal definition of dumping deviates substantially from the economic definition. Since it is often difficult to prove that foreign firms charge higher prices to domestic than export customers, the United States and other nations instead often try to calculate a supposed fair price based on estimates of foreign production costs. This "fair price" rule can interfere with perfectly normal business practices: A firm may well be willing to sell a product for a loss while it is lowering its costs through experience or breaking into a new market. In spite of almost universal negative assessments from economists, however, formal complaints about dumping have been filed with growing frequency since about 1970. As of April 2001, the United States had anti-dumping duties or "countervailing" duties (which are supposed to offset foreign subsidies) on 265 items from 40 different countries. Among the 38 items from China subject to duties were cased pencils, cotton shop towels, paper clips, paintbrushes, sparklers, and freshwater crawfish tailmeat. Is this just cynical abuse of the law, or does it reflect a real increase in the importance of dumping? The answer may be a little of both.

8

The formal condition for price discrimination is that firms will charge lower prices in markets in which they lace a higher elasticity of derrjand, where the elasticity is the percentage decrease in sales that results from a 1 percent increase in price. Firms will dump if they perceive a higher elasticity on export sales than on domestic sales.

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Why may dumping have increased? Because of the uneven pace at which countries have opened up their markets. Since 1970 trade liberalization and deregulation have opened up international competition in a number of previously sheltered industries. For example, it used to be taken for granted that telephone companies would buy their equipment from domestic manufacturers. With the breakup of AT&T in the United States and the privatization of phone companies in other countries, this is no longer the case everywhere. But in Japan and several European countries the old rules still apply. It is not surprising that the manufacturers of telephone equipment in these countries would continue to charge high prices at home while offering lower prices to customers in the United States—or at least that they would be accused of doing so.

Reciprocal Dumping The analysis of dumping suggests that price discrimination can actually give rise to international trade. Suppose there are two monopolies, each producing the same good, one in Home and one in Foreign. To simplify the analysis, assume that these two firms have the same marginal cost. Suppose also that there are some costs of transportation between the two markets, so that if the firms charge the same price there will be no trade. In the absence of trade, each firm's monopoly would be uncontested. If we introduce the possibility of dumping, however, trade may emerge. Each firm will limit the quantity it sells in its home market, recognizing that if it tries to sell more it will drive down the price on its existing domestic sales. If a firm can sell a little bit in the other market, however, it will add to its profits even if the price is lower than in the domestic market, because the negative effect on the price of existing sales will fall on the other firm, not on itself. So each firm has an incentive to "raid" the other market, selling a few units at a price that (net of transportation costs) is lower than the home market price but still above marginal cost. If both firms do this, however, the result will be the emergence of trade even though there was (by assumption) no initial difference in the price of the good in the two markets, and even though there are some transportation costs. Even more peculiarly, there will be two-way trade in the same product. For example, a cement plant in country A might be shipping cement to country B while a cement plant in B is doing the reverse. The situation in which dumping leads to two-way trade in the same product is known as reciprocal dumping. 9 This may seem like a strange case, and it is admittedly probably rare in international trade for exactly identical goods to be shipped in both directions at once. However, the reciprocal dumping effect probably tends to increase the volume of trade in goods that are not quite identical. Is such peculiar and seemingly pointless trade socially desirable? The answer is ambiguous. It is obviously wasteful to ship the same good, or close substitutes, back and forth when transportation is costly. However, notice that the emergence of reciprocal dumping in our story

'The possibility of reciprocal dumping was first noted by James Brander, "Intraindustry Trade in Identical Commodities," Journal of International

Economics

11 (1981), pp. 1-14.

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eliminates what were initially pure monopolies, leading to some competition. The increased competition represents a benefit that may offset the waste of resources in transportation. The net effect of such peculiar trade on a nation's economic welfare is therefore uncertain.

he Theory of External Economies In the monopolistic competition model of trade it is presumed that the economies of scale that give rise to international trade occur at the level of the individual firm. That is, the larger any particular firm's output of a product, the lower its average cost. The inevitable result of such economies of scale at the level of the firm is imperfect competition, which in turn allows such practices as dumping. As we pointed out early in this chapter, however, not all scale economies apply at the level of the individual firm. For a variety of reasons, it is often the case that concentrating production of an industry in one or a few locations reduces the industry's costs, even if the individual firms in the industry remain small. When economies of scale apply at the level of the industry rather than at the level of the individual firm, they are called external economies. The analysis of external economies goes back more than a century to the British economist Alfred Marshall, who was struck by the phenomenon of "industrial districts"— geographical concentrations of industry that could not be easily explained by natural resources. In Marshall's time the most famous examples included such concentrations of industry as the cluster of cutlery manufacturers in Sheffield and the cluster of hosiery firms in Northampton. Modern examples of industries where there seem to be powerful external economies include the semiconductor industry, concentrated in California's famous Silicon Valley; the investment banking industry, concentrated in New York; and the entertainment industry, concentrated in Hollywood. Marshall argued that there were three main reasons why a cluster of firms may be more efficient than an individual firm in isolation: the ability of a cluster to support specialized suppliers; the way that a geographically concentrated industry allows labor market pooling; and the way that a geographically concentrated industry helps foster knowledge spillovers. These same factors continue to be valid today.

Specialized Suppliers In many industries, the production of goods and services—and to an even greater extent, the development of new products—requires the use of specialized equipment or support services; yet an individual company does not provide a large enough market for these services to keep the suppliers in business. A localized industrial cluster can solve this problem by bringing together many firms that collectively provide a large enough market to support a wide range of specialized suppliers. This phenomenon has been extensively documented in Silicon Valley: A 1994 study recounts how, as the local industry grew, "engineers left established semiconductor companies to start firms that manufactured capital goods such as diffusion ovens, step-and-repeat cameras, and testers, and materials and components such as photomasks, testing jigs, and specialized chemicals.... This independent equipment sector promoted the continuing formation of semiconductor firms by freeing individual producers from the expense of developing capital equipment internally and by spreading the costs of

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development. It also reinforced the tendency toward industrial localization, as most of these specialized inputs were not available elsewhere in the country."10 As the quote suggests, the availability of this dense network of specialized suppliers has given high-technology firms in Silicon Valley some considerable advantages over firms elsewhere. Key inputs are cheaper and more easily available because there are many firms competing to provide them, and firms can concentrate on what they do best, contracting out other aspects of their business. For example, some Silicon Valley firms that specialize in providing highly sophisticated computer chips for particular customers have chosen to become "fabless," that is, they do not have any factories in which chips can be fabricated. Instead, they concentrate on designing the chips, then hire another firm actually to fabricate them. A company that tried to enter the industry in another location—for example, in a country that did not have a comparable industrial cluster—would be at an immediate disadvantage because it would lack easy access to Silicon Valley's suppliers and would either have to provide them for itself or be faced with the task of trying to deal with Silicon Valley-based suppliers at long distance. Labor Market Pooling A second source of external economies is the way that a cluster of firms can create a pooled market for workers with highly specialized skills. Such a pooled market is to the advantage of both the producers and the workers as the producers are less likely to suffer from labor shortages, while the workers are less likely to become unemployed. The point can best be made with a simplified example. Imagine that there are two companies that both use the same kind of specialized labor, say, two film studios that make use of experts in computer animation. Both employers are, however, uncertain about how many workers they will want to hire: If demand for its product is high, both companies will want to hire 150 workers, but if it is low, they will only want to hire 50. Suppose also that there are 200 workers with this special skill. Now compare two situations: one with both firms and all 200 workers in the same city, the other with the firms and 100 workers in two different cities. It is straightforward to show that both the workers and their employers are better off if everyone is in the same place. First, consider the situation from the point of view of the companies. If they are in different locations, whenever one of the companies is doing well it will be confronted with a labor shortage; it will want to hire 150 workers, but only 100 will be available. If the firms are near each other, however, it is at least possible that one will be doing well when the other is doing badly, so that both firms may be able to hire as many workers as they want. So by locating near each other, the companies increase the likelihood that they will be able to take advantage of business opportunities. From the workers' point of view, having the industry concentrated in one location is also an advantage. If the industry is divided between two cities, then whenever one of the firms has a low demand for workers the result will be unemployment; the firm will be willing to hire only 50 of the 100 workers who live nearby. But if the industry is concentrated in a single city, low labor demand from one firm will at least sometimes be offset by high demand from the other. As a result, workers will have a lower risk of unemployment.

"See the book listed in Further Reading by Saxenian, p. 40.

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Again, these advantages have been documented for Silicon Valley, where it is common both for companies to expand rapidly and for workers to change employers. The same study of Silicon Valley that was quoted previously notes that the concentration of firms in a single location makes it easy to switch employers, quoting one engineer as saying that "it wasn't that big a catastrophe to quit your job on Friday and have another job on Monday. .. . You didn't even necessarily have to tell your wife. You just drove off in another direction on Monday morning."" This flexibility makes Silicon Valley an attractive location both for highly skilled workers and for the companies that employ them. Knowledge Spillovers It is by now a cliche that in the modern economy knowledge is at least as important an input as factors of production like labor, capital, and raw materials. This is especially true in highly innovative industries, where being only a few months behind the cutting edge in production techniques or product design can put a company at a major disadvantage. But where does the specialized knowledge that is crucial to success in innovative industries come from? Companies can acquire technology through their own research and development efforts. They can also try to learn from competitors by studying their products and, in some cases, taking them apart to "reverse engineer" their design and manufacture. An important source of technical know-how, however, is the informal exchange of information and ideas that takes place at a personal level. And this kind of informal diffusion of knowledge often seems to take place most effectively when an industry is concentrated in a fairly small area, so that employees of different companies mix socially and talk freely about technical issues. Marshall described this process memorably when he wrote that in a district with many firms in the same industry, "The mysteries of the trade become no mystery, but are as it were in the air. . . . Good work is rightly appreciated, inventions and improvements in machinery, in processes and the general organization of the business have their merits promptly discussed: if one man starts a new idea, it is taken up by others and combined with suggestions of their own; and thus it becomes the source of further new ideas."12 A journalist described how these knowledge spillovers worked during the rise of Silicon Valley (and also gave an excellent sense of the amount of specialized knowledge involved in the industry) as follows: "Every year there was some place, the Wagon Wheel, Chez Yvonne, Rickey's, the Roundhouse, where members of this esoteric fraternity, the young men and women of the semiconductor industry, would head after work to have a drink and gossip and trade war stories about phase jitters, phantom circuits, bubble memories, pulse trains, bounceless contacts, burst modes, leapfrog tests, p-n junctions, sleeping sickness modes, slowdeath episodes, RAMs, NAKs, MOSes, PCMs, PROMs, PROM blowers, PROM blasters, and teramagnitudes. . . ."13 This kind of informal information flow means that it is easier for companies in the Silicon Valley area to stay near the technological frontier than it is for companies elsewhere; indeed, many multinational firms have established research centers and even factories in Silicon Valley simply in order to keep up with the latest technology.

ll

Saxenian, p. 35.

12

Alfred Marshall, Principles of Economics, London: MacMillan, 1920.

'•'Tom Wolfe, quoted in Saxenian, p. 33.

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External Economies and Increasing Returns A geographically concentrated industry is able to support specialized suppliers, provide a pooled labor market, and facilitate knowledge spillovers in a way that a geographically dispersed industry cannot. But a country cannot have a large concentration of firms in an industry unless it possesses a large industry. Thus the theory of external economies indicates that when these external economies are important, a country with a large industry will, other things being equal, be more efficient in that industry than a country with a small industry. Or to put it differently, external economies can give rise to increasing returns to scale at the level of the national industry. While the details of external economies in practice are often quite subtle and complex (as the example of Silicon Valley shows), it can be useful to abstract from the details and represent external economies simply by assuming that an industry's costs are lower, the larger the industry. If we ignore possible imperfections in competition, this means that the industry will have a forward-falling supply curve: The larger the industry's output, the lower the price at which firms are willing to sell their output.

ternal Economies and International Trade External economies, like economies of scale that are internal to firms, play an important role in international trade, but they may be quite different in their effects. In particular, external economies can cause countries to get "locked in" to undesirable patterns of specialization and can even lead to losses from international trade. External Economies and the Pattern of Trade When there are external economies of scale, a country that has large production in some industry will tend, other things equal, to have low costs of producing that good. This gives rise to an obvious circularity, since a country that can produce a good cheaply will also therefore tend to produce a lot of that good. Strong external economies tend to confirm existing patterns of interindustry trade, whatever their original sources: Countries that start out as large producers in certain industries, for whatever reason, tend to remain large producers. They may do so even if some other country could potentially produce the goods more cheaply. Figure 6-9 illustrates this point. We show the cost of producing a watch as a function of the number of watches produced annually. Two countries are shown: "Switzerland" and "Thailand." The Swiss cost of producing a watch is shown as ACsmss; the Thai cost as ACTHAI. D represents the world demand for watches, which we assume can be satisfied either by Switzerland or by Thailand. Suppose that the economies of scale in watch production are entirely external to firms, and that since there are no economies of scale at the level of the firm the watch industry in each country consists of many small perfectly competitive firms. Competition therefore drives the price of watches down to its average cost. We assume that the Thai cost curve lies below the Swiss curve, say because Thai wages are lower than Swiss. This means that at any given level of production, Thailand could manufacture watches more cheaply than Switzerland. One might hope that this would always imply that Thailand will in fact supply the world market. Unfortunately, this need not be the case. Suppose that Switzerland, for historical reasons, establishes its watch

CHAPTER 6 '•r t '

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Economies of Scale, Imperfect Competition, and International Trade •

•figure 6-9 I External Economies and Specialization The average cost curve for Thailand,

Price, cost (per watch)

ACTHM, lies below the average cost curve for Switzerland, ACSW/SS. Thus Thailand could potentially supply the world market more cheaply than Switzerland. If the Swiss industry gets established first, however, it may be able to sell watches at the price P,, which is below the cost Co that an individual Thai firm would face if it began production on its own. So a pattern of specialization established by historical accident may persist even when new producers could potentially

Q1

Quantity of watches produced and demanded

have lower costs.

industry first. Then initially world watch equilibrium will be established at point 1 in Figure 6-9, with Swiss production of Q1 units per year and a price of Py Now introduce the possibility of Thai production. If Thailand could take over the world market, the equilibrium would move to point 2. However, if there is no initial Thai production (Q = 0), any individual Thai firm considering manufacture of watches will face a cost of production of CQ. As we have drawn it, this cost is above the price at which the established Swiss industry can produce watches. So although the Thai industry could potentially make watches more cheaply than Switzerland, Switzerland's head start enables it to hold onto the industry. As this example shows, external economies potentially give a strong role to historical accident in determining who produces what, and may allow established patterns of specialization to persist even when they run counter to comparative advantage. Trade and Welfare with External Economies Trade based on external economies has more ambiguous effects on national welfare than either trade based on comparative advantage or trade based on economies of scale at the level of the firm. There may be gains to the world economy from concentrating production in particular industries to realize external economies. On the other hand, there is no guarantee that the right country will produce a good subject to external economies, and it is possible that trade based on external economies may actually leave a country worse off than it would have been in the absence of trade. An example of how a country can actually be worse off with trade than without is shown in Figure 6-10. In this example, as before, we imagine that Thailand and Switzerland could both manufacture watches, that Thailand could make them more cheaply, but that Switzerland has gotten there first. DWORLD is the world demand for watches, and, given that Switzerland produces the watches, the equilibrium is at point 1. However, we now add to the figure the Thai demand for watches, DTHAI. If no trade in watches were allowed and

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Figure 6^J0TExtemal Economies and Losses from Trade When there are external economies,

Price, cost (per watch)

trade can potentially leave a country worse off than it would be in the absence of trade. In this example, Thailand imports watches from Switzerland, which is able to supply the world market (DW0RLD) at a price (P^ low enough to block entry by Thai producers who must initially produce the watches at cost Co. Yet if Thailand were to block all trade in watches, it would be able to supply its domestic market (DTHAt) at the lower price Pr

Quantity of watches produced and demanded

Thailand were forced to be self-sufficient, then the Thai equilibrium would be at point 2. Because of its lower average cost curve, the price of Thai-made watches at point 2, P2, is actually lower than the price of Swiss-made watches at point 1, P,. We have shown a situation in which the price of a good that Thailand imports would actually be lower if there were no trade and the country were forced to produce the good for itself. Clearly in this situation trade leaves the country worse off than it would be in the absence of trade. There is an incentive in this case for Thailand to protect its potential watch industry from foreign competition. Before concluding that this justifies protectionism, however, we should note that in practice identifying cases like that in Figure 6-10 is far from easy. Indeed, as we will emphasize in Chapters 10 and 11, the difficulty of identifying external economies in practice is one of the main arguments against activist government policies toward trade. It is also worth pointing out that while external economies can sometimes lead to disadvantageous patterns of specialization and trade, it is still to the benefit of the world economy to take advantage of the gains from concentrating industries. Canada might be better off if Silicon Valley were near Toronto instead of San Francisco; Germany might be better off if the City (London's financial district, which, along with Wall Street, dominates world financial markets) could be moved to Frankfurt. The world as a whole is, however, more efficient and thus richer because international trade allows nations to specialize in different industries and thus reap the gains from external economies as well as the gains from comparative advantage.

Dynamic Increasing Returns Some of the most important external economies probably arise from the accumulation of knowledge. When an individual firm improves its products or production techniques through experience, other firms are likely to imitate the firm and benefit from its knowl-

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153

TINSELTOWN ECONOMICS What is America's most important export sector? The answer depends to some extent on definitions; some people will tell you that it is agriculture, others that it is aircraft. By any measure, however, one of the biggest exporters in the United States is the entertainment sector, which earned more than $8 billion in overseas sales in 1994. American-made movies and television programs are shown almost everywhere on earth. The overseas market has also become crucial to Hollywood's finances: Action movies, in particular, often earn more outside the United States than they do at home. Why is the United States the world's dominant exporter of entertainment? There are important advantages arising from the sheer size of the American market. A film aimed primarily at the French or Italian markets, which are far smaller than that of the United States, cannot justify the huge budgets of many American films. Thus films from these countries are typically dramas or comedies whose appeal fails to survive dubbing or subtitles. Meanwhile, American films can transcend the language barrier with lavish productions and spectacular special effects. But an important part of the American dominance in the industry also comes from the external economies created by the immense concentration of entertainment firms in Hollywood. Hollywood clearly generates two of Marshall's types of external economies: specialized suppliers and labor market pooling. While the final product is provided by movie studios and television networks, these in turn draw on a complex web of independent producers, casting and talent agencies, legal firms, special effects experts, and so on. And the need for labor market pooling is obvious to anyone who has watched the credits at the end of a movie: Each production requires a huge but temporary

army that includes not just cameramen and makeup artists but musicians, stunt men and women, and mysterious occupations like gaffers and grips (and—oh yes—actors and actresses). Whether it also generates the third kind of external economies—knowledge spillovers—is less certain. After all, as the author Nathaniel West once remarked, the key to understanding the movie business is to realize that "nobody knows anything." Still, if there is any knowledge to spill over, surely it does so better in the intense social environment of Hollywood than it could anywhere else. An indication of the force of Hollywood's external economies has been its persistent ability to draw talent from outside the United States. From Garbo and von Sternberg to Arnold Schwarzenegger and Paul Verhoeven, "American" films have often been made by ambitious foreigners who moved to Hollywood—and in the end reached a larger audience even in their original nations than they could have if they had remained at home. Is Hollywood unique? No, similar forces have led to the emergence of several other entertainment complexes. In India, whose film market has been protected from American domination partly by government policy and partly by cultural differences, a movie-making cluster known as "Bollywood" has emerged in Bombay. A substantial film industry catering to Chinese speakers has emerged in Hong Kong. And a specialty industry producing Spanish-language television programs for all of Latin America, focusing on so-called telenovelas, long-running soap operas, has emerged in Caracas, Venezuela. This last entertainment complex has discovered some unexpected export markets: Television viewers in Russia, it turns out, identify more readily with the characters in Latin American soaps than with those in U.S. productions.

edge. This spillover of knowledge gives rise to a situation in which the production costs of individual firms fall as the industry as a whole accumulates experience. Notice that external economies arising from the accumulation of knowledge differ somewhat from the external economies considered so far, in which industry costs depend on current output. In this alternative situation industry costs depend on experience, usually

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Figure 6-11 I The Learning'Curve The learning curve shows that unit

Unit cost

cost is lower the greater the cumulative output of a country's industry to date. A country that has extensive experience in an industry (L) may have lower unit cost than another country with little or no experience, even if the second country's learning curve (L*) is lower, for example, because of lower wages.

Cumulative output

measured by the cumulative output of the industry to date. For example, the cost of producing a ton of steel might depend negatively on the total number of tons of steel produced by a country since the industry began. This kind of relationship is often summarized by a learning curve that relates unit cost to cumulative output. Such learning curves are illustrated in Figure 6-11. They are downward sloping because of the effect of the experience gained through production on costs. When costs fall with cumulative production over time, rather than with the current rate of production, this is referred to as a case of dynamic increasing returns. Like ordinary external economies, dynamic external economies can lock in an initial advantage or head start in an industry. In Figure 6-11, the learning curve L is that of a country that pioneered an industry, while L* is that of another country that has lower input costs—say, lower wages—but less production experience. Provided that the First country has a sufficiently large head start, the potentially lower costs of the second country may not allow it to enter the market. For example, suppose the first country has a cumulative output of Q{ units, giving it a unit cost of Cv while the second country has never produced the good. Then the second country will have an initial start-up cost C% that is higher than the current unit cost, C,, of the established industry. Dynamic scale economies, like external economies at a point in time, potentially justify protectionism. Suppose that a country could have low enough costs to produce a good for export if it had more production experience, but that given the current lack of experience the good cannot be produced competitively. Such a country might increase its long-term welfare either by encouraging the production of the good by a subsidy or by protecting it from foreign competition until the industry could stand on its own feet. The argument for temporary protection of industries to enable them to gain experience is known as the infant industry argument and has played an important role in debates over the role of trade policy in economic development. We will discuss the infant industry argument at greater

CHAPTER 6

Economies of Scale, Imperfect Competition, and International Trade

length in Chapter 10, but for now we simply note that situations like that illustrated in Figure 6-11 are just as hard to identify in practice in those involving nondynamic increasing returns.

Summary 1. Trade need not be the result of comparative advantage. Instead, it can result from increasing returns or economies of scale, that is, from a tendency of unit costs to be lower with larger output. Economies of scale give countries an incentive to specialize and trade even in the absence of differences between countries in their resources or technology. Economies of scale can be internal (depending on the size of the firm) or external (depending on the size of the industry). 2. Economies of scale normally lead to a breakdown of perfect competition, so that trade in the presence of economies of scale must be analyzed using models of imperfect competition. Two important models of this kind are the monopolistic competition model and the dumping model. A third model, that of external economies, is consistent with perfect competition. 3. In monopolistic competition, an industry contains a number of firms producing differentiated products. These firms act as individual monopolists, but additional firms enter a profitable industry until monopoly profits are competed away. Equilibrium is affected by the size of the market: A large market will support a larger number of firms, each producing at larger scale and thus lower average cost, than a small market. 4. International trade allows creation of an integrated market that is larger than any one country's market, and thus makes it possible simultaneously to offer consumers a greater variety of products and lower prices. 5. In the monopolistic competition model, trade may be divided into two kinds. Twoway trade in differentiated products within an industry is called intraindustry trade; trade that exchanges the products of one industry for the products of another is called interindustry trade. Intraindustry trade reflects economies of scale; interindustry trade reflects comparative advantage. Intraindustry trade does not generate the same strong effects on income distribution as interindustry trade. 6. Dumping occurs when a monopolistic firm charges a lower price on exports than it charges domestically. It is a profit-maximizing strategy when export sales are more price-responsive than domestic sales, and when firms can effectively segment markets, that is, prevent domestic customers from buying goods intended for export markets. Reciprocal dumping occurs when two monopolistic firms dump into each others' home markets; such reciprocal dumping can be a cause of international trade. 7. External economies are economies of scale that occur at the level of the industry instead of the firm. They give an important role to history and accident in determining the pattern of international trade. When external economies are important, a country starting with a large industry may retain that advantage even if another country could potentially produce the same goods more cheaply. When external economies are important, countries can conceivably lose from trade.

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Key Terms average cost, p. 125 dumping, p. 142 dynamic increasing returns, p. 154 external economies of scale, p. 122 forward-falling supply curve, p. 150 imperfect competition, p. 123 infant industry argument, p. 154 interindustry trade, p. 137 internal economies of scale, p. 122 intraindustry trade, p. 137 knowledge spillovers, p. 147

labor market pooling, p. 147 learning curve, p. 154 marginal cost, p. 125 marginal revenue, p. 123 monopolistic competition, p. 126 oligopoly, p. 126 price discrimination, p. 142 pure monopoly, p. 123 reciprocal dumping, p. 146 specialized suppliers, p. 147

Problems 1. For each of the following examples, explain whether this is a case of external or internal economies of scale: a. Most musical wind instruments in the United States are produced by more than a dozen factories in Elkhart, Indiana. b. All Hondas sold in the United States are either imported or produced in Marysville, Ohio. c. All airframes for Airbus, Europe's only producer of large aircraft, are assembled in Toulouse, France. d. Hartford, Connecticut, is the insurance capital of the northeastern United States. 2. In perfect competition, firms set price equal to marginal cost. Why isn't this possible when there are internal economies of scale? 3. It is often argued that the existence of increasing returns is a source of conflict between countries, since each country is better off if it can increase its production in those industries characterized by economies of scale. Evaluate this view in terms of both the monopolistic competition and the external economy models. 4. Suppose the two countries we considered in the numerical example on pages 133-136 were to integrate their automobile market with a third country with an annual market for 3.75 million automobiles. Find the number of firms, the output per firm, and the price per automobile in the new integrated market after trade. 5. Evaluate the relative importance of economies of scale and comparative advantage in causing the following: a. Most of the world's aluminum is smelted in Norway or Canada. b. Half of the world's large jet aircraft are assembled in Seattle. c. Most semiconductors are manufactured in either the United States or Japan. d. Most Scotch whiskey comes from Scotland. e. Much of the world's best wine comes from France. 6. There are some shops in Japan that sell Japanese goods imported back from the United States at a discount over the prices charged by other Japanese shops. How is this possible? 7. Consider a situation similar to that in Figure 6-9, in which two countries that can produce a good are subject to forward-falling supply curves. In this case, however,

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suppose that the two countries have the same costs, so that their supply curves are identical. a. What would you expect to be the pattern of international specialization and trade? What would determine who produces the good? b. What are the benefits of international trade in this case? Do they accrue only to the country that gets the industry? 8. It is fairly common for an industrial cluster to break up and for production to move to locations with lower wages when the technology of the industry is no longer rapidly improving—when it is no longer essential to have the absolutely most modern machinery, when the need for highly skilled workers has declined, and when being at the cutting edge of innovation conveys only a small advantage. Explain this tendency of industrial clusters to break up in terms of the theory of external economies.

Further Reading

I I I

Frank Graham. "Some Aspects of Protection Further Considered." Quarterly Journal of Economics 37 (1923), pp. 199-227. An early warning that international trade may be harmful in the presence of external economies of scale. Elhanan Helpman and Paul Krugman. Market Structure and Foreign Trade. Cambridge: MIT Press, 1985. A technical presentation of monopolistic competition and other models of trade with economies of scale. Henryk Kierzkowski, ed. Monopolistic Competition in International Trade. Oxford: Clarendon Press, 1984. A collection of papers representing many of the leading researchers in imperfect competition and international trade. Staffan Burenstam Linder. An Essay on Trade and Transformation. New York: John Wiley and Sons, 1961. An early and influential statement of the view that trade in manufactures among advanced countries mainly reflects forces other than comparative advantage. Michael Porter. The Competitive Advantage of Nations. New York: Free Press, 1990. A best-selling book that explains national export success as the result of self-reinforcing industrial clusters, that is, external economies. Annalee Saxenian. Regional Advantage. Cambridge: Harvard University Press, 1994. A fascinating comparison of two high-technology industrial districts, California's Silicon Valley and Boston's Route 128.

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APPENDIX TO CHAPTER 6

Determining Marginal Revenue In our exposition of monopoly and monopolistic competition, we found it useful to have an algebraic statement of the marginal revenue faced by a firm given the demand curve it faced. Specifically, we asserted that if a firm faces the demand curve Q = A-BXP, its marginal revenue is MR = P- (MB) X Q.

(6A-2)

In this appendix we demonstrate why this is true. Notice first that the demand curve can be rearranged to state the price as a function of the firm's sales rather than the other way around. By rearranging (6A-1) we get P = (A/B) - (l/B) X Q.

(6A-3)

The revenue of a firm is simply the price it receives per unit multiplied by the number of units it sells. Letting R denote the firm's revenue, we have R = PXQ=

[(A/B) - (1/B) X Q] X Q.

(6A-4)

Let us next ask how the revenue of a firm changes if it changes its sales. Suppose that the firm decides to increase its sales by a small amount dX, so that the new level of sales is Q — Q + dQ. Then the firm's revenue after the increase in sales, R\ will be R' = P'XQ'=

[(A/B) - (l/B) X(Q + dQ)] X (Q + dQ)

= [(A/B) - (l/B) XQ]XQ

+ [(A/B) - (MB) X Q] X dQ

- (MB) X Q X dQ - (l/B) X (dQ)2.

(6A-5)

Equation (6A-5) can be simplified by substitution in from (6A-1) and (6A-4) to get R' = R + PXdQ-

(l/B) XQXdQ-

(MB) X (dQ)2.

(6A-6)

When the change in sales dQ is small, however, its square (dQ)2 is very small (e.g., the square of 1 is 1, but the square of 1/10 is 1/100). So for a small change in Q, the last term in (6A-6) can be ignored. This gives us the result that the change in revenue from a small change in sales is R ' - R = [ P - (MB) X Q ] X d Q .

(6A-7)

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So the increase in revenue per unit of additional sales—which is the definition of marginal revenue—is MR = (/?' - R)ldQ = Pwhich is just what we asserted in equation (6A-2).

(l/B) X Q,

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International Factor Movements

u

I p to this point we have concerned ourselves entirely with international trade. That is, we have focused on the causes and effects of international exchanges of goods and services. Movement of goods and services is not, however, the only form of international integration. This chapter is concerned with another form of integration, international movements of factors of production, or factor movements. Factor movements include labor migration, the transfer of capital via international borrowing and lending, and the subtle international linkages involved in the formation of multinational corporations. The principles of international factor movement do not differ in their essentials from those underlying international trade in goods. Both international borrowing and lending and international labor migration can be thought of as analogous in their causes and effects to the movement of goods analyzed in Chapters 2 through 5. The role of the multinational corporation may be understood by extending some of the concepts developed in Chapter 6. So when we turn from trade in goods and services to factor movements we do not make a radical shift in emphasis. Although there is a fundamental economic similarity between trade and factor movements, however, there are major differences in the political context. A labor-abundant country may under some circumstances import capital-intensive goods; under other circumstances it may acquire capital by borrowing abroad. A capital-abundant country may import labor-intensive goods or begin employing migrant workers. A country that is too small to support firms of efficient size may import goods where large firms have an advantage or allow those goods to be produced locally by subsidiaries of foreign firms. In each case the alternative strategies may be similar in their purely economic consequences but radically different in their political acceptability. On the whole, international factor movement tends to raise even more political difficulties than international trade. Thus factor movements are subject to more restriction than trade in goods. Immigration restrictions are nearly universal. Until the 1980s several European countries, such as France, maintained controls on capital movements even though they had virtually free trade in goods with their neighbors. Investment by foreignbased multinational corporations is regarded with suspicion and tightly regulated through much of the world. The result is that factor movements are probably less important in practice than trade in goods, which is why we took an analysis of trade in the absence of

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factor movements as our starting point. Nonetheless, factor movements are very important, and it is valuable to spend a chapter on their analysis. This chapter is in three parts. We begin with a simple model of international labor mobility. We then proceed to an analysis of international borrowing and lending, in which we show that this lending can be interpreted as trade over time: The lending country gives up resources now to receive repayment in the future, while the borrower does the reverse. Finally, the last section of the chapter analyzes multinational corporations, m

International Labor Mobility We begin our discussion with an analysis of the effects of labor mobility. In the modern world, restrictions on the flow of labor are legion—just about every country imposes restrictions on immigration. Thus labor mobility is less prevalent in practice than capital mobility. It remains important, however; it is also simpler in some ways to analyze than capital movement, for reasons that will become apparent later in the chapter. A One-Good Model Without Factor Mobility As in the analysis of trade, the best way to understand factor mobility is to begin with a world that is not economically integrated, then examine what happens when international transactions are allowed. Let's assume that we have, as usual, a two-country world consisting of Home and Foreign, each with two factors of production, land and labor. We assume for the moment, however, that this world is even simpler than the one we examined in Chapter 4, in that the two countries produce only one good, which we will simply refer to as "output." Thus there is no scope for ordinary trade, the exchange of different goods, in this world. The only way for these economies to become integrated with each other is via movement of either land or labor. Land almost by definition cannot move, so this is a model of integration via international labor mobility. Before we introduce factor movements, however, let us analyze the determinants of the level of output in each country. Land (T) and labor (L) are the only scarce resources. Thus the output of each country will depend, other things equal, on the quantity of these factors available. The relationship between the supplies of factors on one side and the output of the economy on the other is referred to as the economy's production function, which we denote by Q(T, L). We have already encountered the idea of a production function in Chapter 3. As we noted there, a useful way to look at the production function is to ask how output depends on the supply of one factor of production, holding the quantity of the other factor fixed. This is done in Figure 7-1, which shows how a country's output varies as its employment of labor is varied, holding fixed the supply of land; the figure is the same as Figure 3-1. The slope of the production function measures the increase in output that would be gained by using a little more labor and is thus referred to as the marginal product of labor. As the curve is drawn in Figure 7-1, the marginal product of labor is assumed to fall as the ratio of labor to land rises. This is the normal case: As a country seeks to employ more labor on a given amount of land, it must move to increasingly labor-intensive techniques of production, and this will normally become increasingly difficult the further the substitution of labor for land goes.

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tire 7-1

An Economy s Production Function

This production function, Q(T, L), shows

Output, Q

how output varies with changes in the amount of labor employed, holding

O(T,L)

the amount of land, T, fixed. The larger the supply of labor, the larger is output; however, the marginal product of labor declines as more workers are employed.

Labor, L

Figure 7-2, corresponding to Figure 3-2, contains the same information as Figure 7-1 but plots it in a different way. We now show directly how the marginal product of labor depends on the quantity of labor employed. We also indicate that the real wage earned by each unit of labor is equal to labor's marginal product. This will be true as long as the economy is perfectly competitive, which we assume to be the case. What about the income earned by land? As we showed in the appendix to Chapter 3, the total output of the economy can be measured by the area under the marginal product curve. Of that total output, wages earned by workers equal the real wage rate times the employment of labor, and hence equal the indicated area on the figure. The remainder, also shown, equals rents earned by landowners. Assume that Home and Foreign have the same technology but different overall landlabor ratios. If Home is the labor-abundant country, workers in Home will earn less than those in Foreign, while land in Home earns more than in Foreign. This obviously creates an incentive for factors of production to move. Home workers would like to move to Foreign; Foreign landowners would also like to move their land to Home, but we are supposing that this is impossible. Our next step is to allow workers to move and see what happens. International Labor Movement Now suppose that workers are able to move between our two countries. Workers will move from Home to Foreign. This movement will reduce the Home labor force and thus raise the real wage in Home, while increasing the labor force and reducing the real wage in Foreign. If there are no obstacles to labor movement, this process will continue until the marginal product of labor is the same in the two countries. Figure 7-3 illustrates the causes and effects of international labor mobility. The horizontal axis represents the total world labor force. The workers employed in Home are measured from the left, the workers employed in Foreign from the right. The left vertical axis shows the marginal product of labor in Home; the right vertical axis shows the marginal product of labor in Foreign. Initially we assume that there are OL} workers in Home, L'O*

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International Factor Movements

Figure 7-2 The Marginal Product of Labor The marginal product of labor declines with employment. The area under the

Marginal product of tabor, MPL

marginal product curve equals total output. Given the level of employment, the marginal product determines the real wage; thus the total payment to labor (the real wage times the number of employees) is shown by the rectangle in the figure. The rest of output consists of land rents.

Real wage

K Wages

MPL

Labor, L

workers in Foreign. Given this allocation, the real wage rate would be lower in Home (point C) than in Foreign (point E). If workers can move freely to whichever country offers the higher real wage, they will move from Home to Foreign until the real wage rates are equalized. The eventual distribution of the world's labor force will be one with 01} workers in Home, L?O* workers in Foreign (point A). Three points should be noted about this redistribution of the world's labor force. 1. It leads to a convergence of real wage rates. Real wages rise in Home, fall in Foreign. 2. It increases the world's output as a whole. Foreign's output rises by the area under its marginal product curve from V to L2, while Home's falls by the corresponding area under its marginal product curve. We see from the figure that Foreign's gain is larger than Home's loss, by an amount equal to the colored area ABC in the figure. 3. Despite this gain, some people are hurt by the change. Those who would originally have worked in Home receive higher real wages, but those who would originally have worked in Foreign receive lower real wages. Landowners in Foreign benefit from the larger labor supply, but landowners in Home are made worse off. As in the case of the gains from international trade, then, international labor mobility, while allowing everyone to be made better off in principle, leaves some groups worse off in practice. Extending the Analysis We have just seen that a very simple model tells us quite a lot about both why international factor movements occur and what effects they have. Labor mobility in our simple model, like trade in the model of Chapter 4, is driven by international differences in resources; also like trade, it is beneficial in the sense that it increases world production yet is associated with strong income distribution effects that make those gains problematic.

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Figure 7-3 Causes and Effects of International Labor Mobility Initially OL1 workers are employed in Home, while CO* workers are

Marginal product of labor

MPL

MPL*

employed in Foreign. Labor migrates from Home to Foreign until OL2 workers are employed in Home, L20* in Foreign, and wages are equalized.

MPL

MPL*

O

Home employment

L2 I 1 Foreign O* ^—v—"" employment Migration of < — labor from Home to Foreign

Total world labor force

Let us consider briefly how the analysis is modified when we add some of the complications we have assumed away. We need to remove the assumption that the two countries produce only one good. Suppose, then, that the countries produce two goods, one more labor intensive than the other. We already know from our discussion of the factor proportions model in Chapter 4 that in this case trade offers an alternative to factor mobility. Home can in a sense export labor and import land by exporting the labor-intensive good and importing the land-intensive good. It is possible in principle for such trade to lead to a complete equalization of factor prices without any need for factor mobility. If this happened, it would of course remove any incentive for labor to move from Home to Foreign. In practice, while trade is indeed a substitute for international factor movement, it is not a perfect substitute. The reasons are those already summarized in Chapter 4. Complete factor price equalization is not observed in the real world because countries are sometimes too different in their resources to remain unspecialized; there are barriers to trade, both natural and artificial; and there are differences in technology as well as resources between countries. We might wonder on the other side whether factor movements do not remove the incentive for international trade. Again the answer is that while in a simple model movement of factors of production can make international trade in goods unnecessary, in practice there are substantial barriers to free movement of labor, capital, and other potentially mobile resources. And some resources cannot be brought together—Canadian forests and Caribbean sunshine cannot migrate. Extending the simple model of factor mobility, then, does not change its fundamental message. The main point is that trade iA factors is, in purely economic terms, very much like trade in goods; it occurs for much the same reasons and produces similar results.

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165

CASE STUDY Wage Convergence in the Age of Mass Migration Although there are substantial movements of people between countries in the modern world, the truly heroic age of labor mobility—when immigration was a major source of population growth in some countries, while emigration caused population in other countries to decline—was in the late nineteenth and early twentieth centuries. In a global economy newly integrated by railroads, steamships, and telegraph cables, and not yet subject to many legal restrictions on migration, tens of millions of people moved long distances in search of a better life. Chinese moved to Southeast Asia and California; Indians to Africa and the Caribbean; a substantial number of Japanese moved to Brazil. Above all, people from the periphery of Europe—from Scandinavia, Ireland, Italy, and Eastern Europe—moved to places where land was abundant and wages were high: the United States, but also Canada, Argentina, and Australia. Did this process cause the kind of real wage convergence that our* model predicts? Indeed it did. The accompanying table shows real wages in 1870, and the change in these wages up to the eve of World War I, for four major "destination" countries and for four important "origin" countries. As the table shows, at the beginning of the period real wages were much higher in the destination than the origin countries. Over the next four decades real wages rose in all countries, but (except for a surprisingly large increase in Canada) they increased much more rapidly in the origin than the destination countries, suggesting that migration actually did move the world toward (although not by any means all the way to) wage equalization. As documented in the case study on the U.S. economy, legal restrictions put an end to the age of mass migration after World War I. For that and other reasons (notably a decline in world trade, and the direct effects of two world wars), convergence in real wages came to a halt and even reversed itself for several decades, only to resume in the postwar years.

Destination countries Argentina Australia Canada United States Origin countries Ireland Italy Norway • Sweden

Real wage, 1870 (U.S. = 100)

Percentage increase in real wage, 1870-1913

53 110 86 100

51 1 121 47

43 23 24 24

84 112 193 250

Source: Jeffrey G. Williamson, "The Evolution of Global Labor Markets since 1830: Background Evidence and Hypotheses," Explorations in Economic History 32 (1995), pp. 141-196.

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CASE

STUDY

Immigration and the U.S. Economy During the twentieth century, the United States has experienced two great waves of immigration. The first, which began in the late nineteenth century, was brought to an end by restrictive legislation introduced in 1924. A new surge of immigration began in the mid-1960s, spurred in part by a major revision of the law in 1965. There is also a rising number of illegal immigrants; the U.S. government estimates their number at 200,000 to 300,000 per year. In the period between the two great waves of immigration, immigrants probably had little effect on the U.S. economy, for two reasons. First, they were not very numerous. Second, the immigration laws allocated visas based on the 1920 ethnic composition of the U.S. population; as a result, immigrants came mainly from Canada and Europe, and so their educational level was fairly similar to that of the people already here. After 1965, however, immigrants came primarily from Latin America and Asia, where workers, on average, were substantially less educated than the average American worker. The accompanying table illustrates this effect by showing the ratio of immigrants to nativeborn workers by education level in the years 1980 and 1990. As you can see from the table, the ratio of immigrants to native-born rose in all categories, but by far the largest increase occurred among workers who had not completed high school. Thus immigration, other things being the same, tended to make less-educated workers more abundant and highly educated workers scarcer. This suggests that immigration may have played a role in the widening wage gap between less and more educated workers over the same period. However, this cannot have been the whole story. Despite the effects of immigration, the fraction of U.S. workers without a high school education dropped over the decade, while the fraction with a college education rose. So overall, educated workers became more abundant, yet their relative wage still increased—probably as a result of technological changes that placed an increasing premium on education.

High-school dropouts High school Some college College

Immigrants as % of native-born workers, 1980

Immigrants as % of native-born workers, 1990

Change, 1980-1990

12.2

26.2 6.1 6.9 9.7

14.0 1.7 1.1 2.2

4.4 5.8 7.5

Source: George Borjas, Richard Freeman, and Lawrence Katz, "Searching for the effect of immigration on the labor market," American Economic Review, May 1996.

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ternational Borrowing and Lending International movements of capital are a prominent feature of the international economic landscape. It is tempting to analyze these movements in a way parallel to our analysis of labor mobility and this is sometimes a useful exercise. There are some important differences, however. When we speak of international labor mobility, it is clear that workers are physically moving from one country to another. International capital movements are not so simple. When we speak of capital flows from the United States to Mexico, we do not mean that U.S. machines are literally being unbolted and shipped south. We are instead talking of a. financial transaction. A U.S. bank lends to a Mexican firm, or U.S. residents buy stock in Mexico, or a U.S. firm invests through its Mexican subsidiary. We focus for now on the first type of transaction, in which U.S. residents make loans to Mexicans—that is, the U.S. residents grant Mexicans the right to spend more than they earn today in return for a promise to repay in the future. The analysis of financial aspects of the international economy is the subject of the second half of this book. It is important to realize, however, that financial transactions do not exist simply on paper. They have real consequences. International borrowing and lending, in particular, can be interpreted as a kind of international trade. The trade is not of one good for another at a point in time but of goods today for goods in the future. This kind of trade is known as intertemporal trade; we will have much more to say about it later in this text, but for present purposes a simple model will be sufficient to make our point.1 Intertemporal Production Possibilities and Trade

Even in the absence of international capital movements, any economy faces a trade-off between consumption now and consumption in the future. Economies usually do not consume all of their current output; some of their output takes the form of investment in machines, buildings, and other forms of productive capital. The more investment an economy undertakes now, the more it will be able to produce and consume in the future. To invest more, however, an economy must release resources by consuming less (unless there are unemployed resources, a possibility we temporarily disregard). Thus there is a trade-off between current and future consumption. Let's imagine an economy that consumes only one good and will exist for only two periods, which we will call present and future. Then there will be a trade-off between present and future production of the consumption good, which we can summarize by drawing an intertemporal production possibility frontier. Such a frontier is illustrated in Figure 7-4. It looks just like the production possibility frontiers we have been drawing between two goods at a point in time. The shape of the intertemporal production possibility frontier will differ among countries. Some countries will have production possibilities that are biased toward present output, while others are biased toward future output. We will ask what real differences these biases correspond to in a moment, but first let's simply suppose that there are two

'The appendix to this chapter contains a more detailed examination of the model developed in this section.

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Figure 7-4 The Intertemporal Production Possibility Frontier A country can trade current consumption for future consumption in the

Future consumption

same way that it can produce more of one good by producing less of another.

Present consumption

countries, Home and Foreign, with different intertemporal production possibilities. Home's possibilities are biased toward current consumption, while Foreign's are biased toward future consumption. Reasoning by analogy, we already know what to expect. In the absence of international borrowing and lending, we would expect the relative price of future consumption to be higher in Home than in Foreign, and thus if we open the possibility of trade over time, we would expect Home to export present consumption and import future consumption. This may, however, seem a little puzzling. What is the relative price of future consumption, and how does one trade over time? The Real Interest Rate

How does a country trade over time? Like an individual, a country can trade over time by borrowing or lending. Consider what happens when an individual borrows: She is initially able to spend more than her income or, in other words, to consume more than her production. Later, however, she must repay the loan with interest, and therefore in the future she consumes less than she produces. By borrowing, then, she has in effect traded future consumption for current consumption. The same is true of a borrowing country. Clearly the price of future consumption in terms of present consumption has something to do with the interest rate. As we will see in the second half of this book, in the real world the interpretation of interest rates is complicated by the possibility of changes in the overall price level. For now, we bypass that problem by supposing that loan contracts are specified in "real" terms: When a country borrows, it gets the right to purchase some quantity of consumption at present in return for repayment of some larger quantity in the future. Specifically, the quantity of repayment in future will be (1 + r) times the quantity borrowed in present, where r is the real interest rate on borrowing. Since the trade-off is one unit of

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consumption in present for (1 + r) units in future, the relative price of future consumption is 1/(1 + r). The parallel with our standard trade model is now complete. If borrowing and lending are allowed, the relative price of future consumption, and thus the world real interest rate, will be determined by the world relative supply and demand for future consumption. Home, whose intertemporal production possibilities are biased toward present consumption, will export present consumption and import future consumption. That is, Home will lend to Foreign in the first period and receive repayment in the second. Intertemporal Comparative Advantage We have assumed that Home's intertemporal production possibilities are biased toward present production. But what does this mean? The sources of intertemporal comparative advantage are somewhat different from those that give rise to ordinary trade. A country that has a comparative advantage in future production of consumption goods is one that in the absence of international borrowing and lending would Jiave a low relative price of future consumption, that is, a high real interest rate. This high real interest rate corresponds to a high return on investment, that is, a high return to diverting resources from current production of consumption goods to production of capital goods, construction, and other activities that enhance the economy's future ability to produce. So countries that borrow in the international market will be those where highly productive investment opportunities are available relative to current productive capacity, while countries that lend will be those where such opportunities are not available domestically. The pattern of international borrowing and lending in the 1970s illustrates the point. Table 22-3 compares the international lending of three groups of countries: industrial countries, non-oil developing countries, and major oil exporters. From 1974 to 1981, the oil exporters lent $395 billion, the less-developed countries borrowed $315 billion, and the (much larger) industrial countries borrowed a smaller amount, $265 billion. In the light of our model, this is not surprising. During the 1970s, as a result of a spectacular increase in oil prices, oil exporters like Saudi Arabia found themselves with very high current income. They did not, however, find any comparable increase in their domestic investment opportunities. That is, they had a comparative advantage in current consumption. With small populations, limited resources other than oil, and little expertise in industrial or other production, their natural reaction was to invest much of their increased earnings abroad. By contrast, rapidly developing countries such as Brazil and South Korea expected to have much higher incomes in the future and saw highly productive investment opportunities in their growing industrial sectors; they had a comparative advantage in future income. Thus in this time frame (1974 to 1981) the oil exporters also exported current consumption by lending their money, in part, to less-developed countries.

irect Foreign Investment and Multinational Firms In the last section we focused on international borrowing and lending. This is a relatively simple transaction, in that the borrower makes no demands on the lender other than that of repayment. An important part of international capital movement, however, takes a different form, that of direct foreign investment. By direct foreign investment we mean international

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DOES CAPITAL MOVEMENT TO DEVELOPING COUNTRIES HURT WORKERS IN HIGH-WAGE COUNTRIES? We have turned repeatedly in this textbook to concerns created by the rapid economic growth of newly industrializing economies (NIEs), mainly in Asia. In Chapter 4 we discussed the concern that trade with the NIEs might, via the StolperSamuelson effect, reduce the real wages of lessskilled workers in advanced nations and saw that it had some justification. In Chapter 5 we turned to the possibility that growth in the NIEs might, by worsening the terms of trade of advanced nations, lower their overall real income but saw that this was unlikely. In the 1990s there was growing worry among some commentators that the export of capital to the NIEs would have a severe impact on the wages of workers in advanced countries. The logic of this view is as follows: If highwage countries finance investment on low-wage

countries, this will mean less savings available to build up the capital stock at home. Because each worker at home will have less capital to work with than she otherwise would, her marginal product— and hence her wage rate—will be lower than it would have been in the absence of the capital movement. Overall real income, including the returns from capital invested abroad, may be higher for the home country than it would otherwise have been, but more than all the gains will go to capital, with labor actually worse off. While this adverse effect is possible in principle, how important is it likely to be in practice? Some influential people have issued stark warnings. For example, Klaus Schwab, the head of Switzerland's influential World Economic Forum, warned that the world faced a "massive redeployment of

Capital Flows to Developing Countries Net capital flows to emerging markets, billions of dollars 240

-20 1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

Flows of capital to low-wage countries. Large capital flows to "non-oil" developing countries (less-developed countries other than major oil exporters) began in the 1970s, then collapsed during the debt crisis of the 1980s.They resumed again after about 1990. Source: International Monetary Fund, International Financial Statistics Yearbook, 1997.

CHAPTER 7 assets" that would end the ability of workers in advanced countries to earn high wages.* Similiar views have been expressed by many journalists. Economists, however, have been generally unimpressed by this argument. They point out that over the longer term capital movements to developing countries have been quite limited. The accompanying figure shows net capital movements to "emerging market" economies between

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171

1977 and 1999. Such capital movements came to a virtual halt during the debt crisis of the 1980s, discussed in Chapter 22. They resumed in the 1990s, only to drop off sharply with the Asian financial crisis of 1997. The movement in 1996, $233 billion, sounds large; but the economies of advanced nations are almost inconceivably large, and even this represented only about 7 percent of their total investment.

*Klaus Schwab and Claude Smadja, "Power and Policy: The New Economic World Order," Harvard Business Review 72, no. 6 (November-December 1994), pp. 40-47.

capital flows in which a firm in one country creates or expands a subsidiary in another. The distinctive feature of direct foreign investment is that it involves not only a transfer of resources but also the acquisition of control. That is, the subsidiary does not simply have a financial obligation to the parent company; it is part of the same organizational structure. When is a corporation multinational? In U.S. statistics, a U.S. company is considered foreign-controlled, and therefore a subsidiary of a foreign-based multinational, if 10 percent or more of the stock is held by a foreign company; the idea is that 10 percent is enough to convey effective control. A U.S.-based company is considered multinational if it has a controlling share of companies abroad. Alert readers will notice that these definitions make it possible for a company to be considered both a U.S. subsidiary of a foreign company and a U.S. multinational. And this sometimes happens: from 1981 until 1995 the chemical company DuPont was officially foreign-controlled (because the Canadian company Seagram owned a large block of its stock) but was also considered an American multinational. In practice, such strange cases are rare: usually multinational companies have a clear national home base. Multinational firms are often a vehicle for international borrowing and lending. Parent companies often provide their foreign subsidiaries with capital, in the expectation of eventual repayment. To the extent that multinational firms provide financing to their foreign subsidiaries, direct foreign investment is an alternative way of accomplishing the same things as international lending. This still leaves open the question, however, of why direct investment rather than some other way of transferring funds is chosen. In any case, the existence of multinational firms does not necessarily reflect a net capital flow from one country to another. Multinationals sometimes raise money for the expansion of their subsidiaries in the country where the subsidiary operates rather than in their home country. Furthermore, there is a good deal of two-way foreign direct investment among industrial countries, U.S. firms expanding their European subsidiaries at the same time that European firms expand their U.S. subsidiaries, for example. The point is that while multinational firms sometimes act as a vehicle for international capital flows, it is probably a mistake to view direct foreign investment as primarily an alternative way for countries to borrow and lend. Instead, the main point of direct foreign investment is to allow the formation of multinational organizations. That is, the extension of control is the essential purpose.

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But why do firms seek to extend control? Economists do not have as fully developed a theory of multinational enterprise as they do of many other issues in international economics. There is some theory on the subject, however, which we now review.

The Theory of Multinational Enterprise The basic necessary elements of a theory of multinational firms can best be seen by looking at an example. Consider the European operations of American auto manufacturers. Ford and General Motors, for example, sell many cars in Europe, but nearly all those cars are manufactured in plants in Germany, Britain, and Spain. This arrangement is familiar, but we should realize that there are two obvious alternatives. On one side, instead of producing in Europe the U.S. firms could produce in the United States and export to the European market. On the other side, the whole market could be served by European producers such as Volkswagen and Renault. Why, then, do we see this particular arrangement, in which the same firms produce in different countries? The modern theory of multinational enterprise starts by distinguishing between the two questions of which this larger question is composed. First, why is a good produced in two (or more) different countries rather than one? This is known as the question of location. Second, why is production in different locations done by the same firm rather than by separate firms? This is known, for reasons that will become apparent in a moment, as the question of internalization. We need a theory of location to explain why Europe does not import its automobiles from the United States; we need a theory of internalization to explain why Europe's auto industry is not independently controlled. The theory of location is not a difficult one in principle. It is, in fact, just the theory of trade that we developed in Chapters 2 through 6. The location of production is often determined by resources. Aluminum mining must be located where the bauxite is, aluminum smelting near cheap electricity. Minicomputer manufacturers locate their skill-intensive design facilities in Massachusetts or northern California and their labor-intensive assembly plants in Ireland or Singapore. Alternatively, transport costs and other barriers to trade may determine location. American firms produce locally for the European market partly to reduce transport costs; since the models that sell well in Europe are often quite different from those that sell well in the United States, it makes sense to have separate production facilities and to put them on different continents. As these examples reveal, the factors that determine a multinational corporation's decisions about where to produce are probably not much different from those that determine the pattern of trade in general. The theory of internalization is another matter. Why not have independent auto companies in Europe? We may note first that there are always important transactions between a multinational's operations in different countries. The output of one subsidiary is often an input into the production of another. Or technology developed in one country may be used in others. Or management may usefully coordinate the activities of plants in several countries. These transactions are what tie the multinational firm together, and the firm presumably exists to facilitate these transactions. But international transactions need not be carried out inside a firm. Components can be sold in an open market, and technology can be licensed to other firms. Multinationals exist because it turns out to be more profitable to carry out these transactions within a firm rather than between firms. This is why the motive for multinationals is referred to as "internalization."

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We have defined a concept, but we have not yet explained what gives rise to internalization. Why are some transactions more profitably conducted within a firm rather than between firms? Here there are a variety of theories, none as well-grounded either in theory or in evidence as our theories of location. We may note two influential views, however, about why activities in different countries may usefully be integrated in a single firm. The first view stresses the advantages of internalization for technology transfer. Technology, broadly defined as any kind of economically useful knowledge, can sometimes be sold or licensed. There are important difficulties in doing this, however. Often the technology involved in, say, running a factory has never been written down; it is embodied in the knowledge of a group of individuals and cannot be packaged and sold. Also, it is difficult for a prospective buyer to know how much knowledge is worth—if the buyer knew as much as the seller, there would be no need to buy! Finally, property rights in knowledge are often hard to establish. If a European firm licenses technology to a U.S. firm, other U.S. firms may legally imitate that technology. All these problems may be reduced if a firm, instead of selling technology, sets about capturing the returns from the technology in other countries by setting up foreign subsidiaries. The second view stresses the advantages of internalization for vertical integration. If one firm (the "upstream" firm) produces a good that is used as an input for another firm (the "downstream" firm), a number of problems can result. For one thing, if each has a monopoly position, they may get into a conflict as the downstream firm tries to hold the price down while the upstream firm tries to raise it. There may be problems of coordination if demand or supply is uncertain. Finally, a fluctuating price may impose excessive risk on one or the other party. If the upstream and downstream firms are combined into a single "vertically integrated" firm, these problems may be avoided or at least reduced. It should be clear that these views are by no means as rigorously worked out as the analysis of trade carried out elsewhere in this book. The economic theory of organizations—which is what we are talking about when we try to develop a theory of multinational corporations—is still in its infancy. This is particularly unfortunate because in practice multinationals are a subject of heated controversy—praised by some for generating economic growth, accused by others of creating poverty. Multinational Firms in Practice Multinational firms play an important part in world trade and investment. For example, about half of U.S. imports are transactions between "related parties." By this we mean that the buyer and the seller are to a significant extent owned and presumably controlled by the same firm. Thus half of U.S. imports can be regarded as transactions between branches of multinational firms. At the same time, 24 percent of U.S. assets abroad consists of the value of foreign subsidiaries of U.S. firms. So U.S. international trade and investment, while not dominated by multinational firms, are to an important extent conducted by such firms. Multinational firms may, of course, be either domestic or foreign-owned. Foreign-owned multinational firms play an important role in most economies and an increasingly important role in the United States. Table 7-1 compares the role of foreign-owned firms in the manufacturing sectors of three major economies. (Bear in mind that foreigners typically own a much larger share of manufacturing than of the economy as a whole.) The table is illuminating, especially for Americans who are not used to the idea of working for foreign-owned

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T a b l e 7- I

France, United Kingdom,and United States: Shares of Foreign-Owned Firms in Manufacturing Sales, Value Added,and Employment, 1985 and 1990 (percentages)

Sales

Value added

Employment

Country

1985

1990

1985

1990

1985

1990

France United Kingdom United States

26.7 20.3 8.0

28.4 24.1 16.4

25.3 18.7 8.3

27.1 21.1 13.4

21.1 14.0 8.0

23.7 14.9 10.8

Source: U.S. Department of Commerce, Foreign Direct Investment in the United States: An Update (1994).

companies and sometimes get nervous about the implications of rising foreign ownership. The first thing the table tells us is that while large-scale foreign ownership may be novel here, it is old hat elsewhere: France is a country proud of its cultural independence, but as long ago as 1985 more than a fifth of French manufacturing workers were employed by foreign firms. The table also confirms, however, that the United States did experience a sharp increase in foreign ownership during the 1980s; for example, the share of foreignowned firms in sales doubled between 1985 and 1990. This increase made the United States more similar to other countries, where substantial foreign ownership has long been a fact of life. Although comparable statistics do not exist, it turns out that the real exception among major economies is Japan, which has very little foreign ownership. This is not because of overt legal restrictions: On paper, foreigners are free to open plants in Japan and buy Japanese companies, with only a few exceptions. But cultural obstacles, such as the unwillingness of many Japanese to work for foreign companies, and perhaps also red-tape barriers thrown up by bureaucrats have prevented large-scale operation of foreign-based multinationals. The important question, however, is what difference multinationals make. With only a limited understanding of why multinationals exist, this is a hard question to answer. Nonetheless, the existing theory suggests some preliminary answers. Notice first that much of what multinationals do could be done without multinationals, although perhaps not as easily. Two examples are the shift of labor-intensive production from industrial countries to labor-abundant nations and capital flows from capital-abundant countries to capital-scarce countries. Multinational firms are sometimes the agents of these changes and are therefore either praised or condemned for their actions (depending on the commentator's point of view). But these shifts reflect the "location" aspect of our theory of multinationals, which is really no different from ordinary trade theory. If multinationals were not there, the same things would still happen, though perhaps not to the same extent. This observation leads international economists to attribute less significance to multinational enterprise than most lay observers. Notice, too, that in a broad sense what multinational corporations do by creating organizations that extend across national boundaries is similar to the effects of trade and simple factor mobility; that is, it is a form of international economic integration. By analogy with the other forms of international integration we have studied, we would expect multination-

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al enterprise to produce overall gains but to produce income distribution effects that leave some people worse off. These income distribution effects are probably mostly effects within rather than between countries. To sum up, multinational corporations probably are not as important a factor in the world economy as their visibility would suggest; their role is neither more nor less likely to be beneficial than other international linkages. This does not, however, prevent them from being cast in the role of villains or (more rarely) heroes, as we will see in our discussion of trade and development in Chapter 10.

CASE STU

DY

Foreign Direct Investment in the United States Until the 1980s, the United States was almost always regarded as a "home" country for multinational companies rather than as a "host" for foreign-based multinationals. Indeed, when the French author Jean-Jacques Servan-Schreiber wrote a best-seller warning of the growing power of multinationals, his book—published in 1968—was titled The American Challenge. This perspective changed in the middle of the 1980s. Figure 7-5 shows U.S. inflows of foreign direct investment—that is, capital either used to acquire control of a U.S. company or invested in a company that foreigners already controlled—as a percentage of GDP. In the second half of the 1980s these flows, which had previously averaged less than 0.5 percent of GDP, surged. Japanese companies began building automobile plants in the United States, and European companies began buying U.S. banks and insurance companies. Foreign direct investment then slumped in the early 1990s, before beginning an astonishing rise in the late 1990s. What was behind these fluctuations? Rather paradoxically, the boom in direct investment in the late 1980s and the even bigger boom in the late 1990s happened for nearly opposite reasons. Much foreign direct investment in the 1980s was driven by a perception of U.S. weakness. At the time, Japanese manufacturing companies, especially in the auto industry, had pulled ahead of their U.S. competitors in productivity and technology. The lower prices and superior quality of Japanese products allowed them to take a rapidly growing share of the U.S. market; in order to serve that market better, the Japanese began to open plants in the United States. Also, in the late 1980s the U.S. dollar was quite weak against both the Japanese yen and European currencies such as the German mark. This made assets in the United States appear cheap and encouraged foreign companies to move in. Perhaps because of the perception that foreigners were taking advantage of U.S. weakness, the surge in foreign direct investment in the 1980s provoked a political backlash. The height of this backlash probably came in 1992, when Michael Crichton published the best-seller Rising Sun, a novel about the evil machinations of a Japanese company operating in the United States. The novel, which was made into a movie starring Sean Connery the next year, came with a long postscript warning about the dangers that Japanese companies posed to the United States. As you can see from Figure 7-5, however, foreign direct investment in the United States was slumping even as Rising Sun hit the bookstores. And public concern faded along with the investment itself.

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Figure 7-5 Foreign Direct Investment in the United States Direct foreign investment, percent of GNP (annual average) 3.5

0.50.0

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

Foreign direct investment flows into the United States surged in 1986-1989 and again after 1992, rapidly raising the share of U.S. production controlled by foreign firms. Source: U.S. Commerce Dept.

When foreign direct investment surged again, in the late 1990s, the situation was very different: now the wave of investment was driven by perceptions of U.S. strength rather than weakness. The United States was experiencing a remarkable economic boom; meanwhile, European growth was modest, and Japan languished in the middle of a decade of economic stagnation. Given the revived economic dominance of the United States, nearly every large company on the planet felt that it had to have a stake in the U.S. economy. And so companies flocked to the United States, mainly by acquiring control of existing U.S. companies. Whether this was a good idea is another question: the troubled acquisition of Chrysler by the German company Daimler-Benz, discussed on p. 177, became a celebrated example of how investing in America could go wrong. The political reception for foreign investors in the 1990s was utterly different from that given to the previous wave. It's not clear to what extent Americans were even aware of the wave of money pouring in; Michael Crichton gave up on economics and went back to writing about dinosaurs. To the extent that the inflow of direct investment was noticed, it was perceived as a tribute to U.S. strength, not as a threat. At the time of writing, the inflow of foreign direct investment was still in progress, even though the U.S. boom officially came to an end in 2001.

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177

TAKEN FOR A RIDE? In November 1998 Germany's Daimler-Benz corporation, the makers of the MercedesBenz, acquired control of America's Chrysler corporation for $40 billion—about $13 billion more than the market value of Chrysler's stock at the time. The new, merged company was named DaimlerChrysler. For the deal to make business sense, the combined company had to be worth more than the two companies were worth separately. In fact, given the premium that Daimler-Benz paid to acquire Chrysler, the merger in effect had to create at least $ 13 billion in value. Where would this gain come from? The answer, according to executives in both companies, was that there would be "synergy" between the two companies—that the whole would be more than the sum of the parts because each company would supply something the other lacked. Skeptical analysts were not convinced. They pointed out that although both companies were in the automobile business, they occupied almost completely different market niches: Daimler-Benz had built its reputation on classy luxury sedans, while Chrysler was much more down-

market: its signature vehicles were minivans and SUVs. So it was unclear whether there would be much gain in terms of either marketing or production efficiencies. In that case, where would the extra value come from? It soon became clear that far from generating synergies, the deal had at least initially created new problems, particularly at Chrysler. Put simply, the cultural differences between the two companies—partly a matter of national style, partly a matter of the personalities involved—created a great deal of misunderstanding and bad feelings. The initial deal was supposedly a merger of equals, but it soon became clear that the German company was the senior parfner; many Chrysler executives left within a year after the merger. Partly as a result of these departures, Chrysler's product development and marketing lagged; within two years after the deal, Chrysler had gone from large profits to large losses. These developments were reflected in a plunge in the new company's stock price: two years after the merger, far from being worth more than the sum of the two companies before the deal, DaimlerChrysler was worth less than either company alone.

Summary 1. International factor movements can sometimes substitute for trade, so it is not surprising that international migration of labor is similar in its causes and effects to international trade based on differences in resources. Labor moves from countries where it is abundant to countries where it is scarce. This movement raises total world output, but it also generates strong income distribution effects, so that some groups are hurt. 2. International borrowing and lending can be viewed as a kind of international trade, but one that involves trade of present consumption for future consumption rather than trade of one good for another. The relative price at which this intertemporal trade takes place is one plus the real rate of interest. 3. Multinational firms, while they often serve as vehicles for international borrowing and lending, primarily exist as ways of extending control over activities taking place in two or more different countries. The theory of multinational firms is not as well

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developed as other parts of international economics. A basic framework can be presented that stresses two crucial elements that explain the existence of a multinational: a location motive that leads the activities of the firm to be in different countries, and an internalization motive that leads these activities to be integrated in a single firm. 4. The location motives of multinationals are the same as those behind all international trade. The internalization motives are less well understood; current theory points to two main motives: the need for a way to transfer technology and the advantages in some cases of vertical integration.

Key Terms location and internalization motives of multinationals, p. 172 real interest rate, p. 168 technology transfer, p. 173 vertical integration, p. 173

direct foreign investment, p. 169 factor movements, p. 160 intertemporal production possibility frontier, p. 167 intertemporal trade, p. 167

Problems 1. In Home and Foreign there are two factors of production, land and labor, used to produce only one good. The land supply in each country and the technology of production are exactly the same. The marginal product of labor in each country depends on employment as follows: Number of Workers Employed 1

2 3 4 5 6 7 8 9 10 11

Marginal Product of Last Worker

20 19 18 17 16 15 14 13 12 11 10

Initially, there are 11 workers employed in Home, but only 3 workers in Foreign. Find the effect of free movement of labor from Home to Foreign on employment, production, real wages, and the income of landowners in each country. 2. Suppose that a labor-abundant country and a land-abundant country both produce labor- and land-intensive goods with the same technology. Drawing on the analysis in Chapter 4, first analyze the conditions under which trade between the two countries eliminates the incentive for labor to migrate. Then, using the analysis in Chapter 5, show that a tariff by one country will create an incentive for labor migration.

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3. Explain the analogy between international borrowing and lending and ordinary international trade. 4. Which of the following countries would you expect to have intertemporal production possibilities biased toward current consumption goods, and which biased toward future consumption goods? a. A country, like Argentina or Canada in the last century, that has only recently been opened for large-scale settlement and is receiving large inflows of immigrants. b. A country, like the United Kingdom in the late nineteenth century or the United States today, that leads the world technologically but is seeing that lead eroded as other countries catch up. c. A country that has discovered large oil reserves that can be exploited with little new investment (like Saudi Arabia). d. A country that has discovered large oil reserves that can be exploited only with massive investment (like Norway, whose oil lies under the North Sea). e. A country like South Korea that has discovered the knack of producing industrial goods and is rapidly gaining on advanced countries. 5. Which of the following are direct foreign investments, and which are not? a. A Saudi businessman buys $10 million of IBM stock. b. The same businessman buys a New York apartment building. c. A French company merges with an American company; stockholders in the U.S. company exchange their stock for shares in the French firm. d. An Italian firm builds a plant in Russia and manages the plant as a contractor to the Russian government. 6. The Karma Computer Company has decided to open a Brazilian subsidiary. Brazilian import restrictions have prevented the firm from selling into that market, while the firm has been unwilling to sell or lease its patents to Brazilian firms because it fears this will eventually hurt its technological advantage in the U.S. market. Analyze Karma's decision in terms of the theory of multinational enterprise.

Further Reading Richard A. Brecher and Robert C. Feenstra. "International Trade and Capital Mobility Between Diversified Economies." Journal of International Economics 14 (May 1983), pp. 321-339. A synthesis of the theories of trade and international factor movements. Richard E. Caves. Multinational Enterprises and Economic Analysis. Cambridge: Harvard University Press, 1982. A view of multinational firms' activities. Wilfred J. Ethier. "The Multinational Firm." Quarterly Journal of Economics 101 (November 1986), pp. 805-833. Models the internalization motive of multinationals. Irving Fisher. The Theory of Interest. New York: Macmillan, 1930. The "intertemporal" approach described in this chapter owes its origin to Fisher. Edward M. Graham and Paul R. Krugman. Foreign Direct Investment in the United States. Washington, D.C.: Institute for International Economics, 1989. A survey of the surge of foreign investment in the United States, with an emphasis on policy issues. Charles P. Kindleberger. American Business Abroad. New Haven: Yale University Press, 1969. A good discussion of the nature and effects of multinational firms, written at a time when such firms were primarily United States-based. Charles P. Kindleberger. Europe's Postwar Growth: The Role of Labor Supply. Cambridge: Harvard University Press, 1967. A good account of the role of labor migration during its height in Europe.

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G. D. A. MacDougall. "The Benefits and Costs of Private Investment from Abroad: A Theoretical Approach." Economic Record 36 (1960), pp. 13-35. A clear analysis of the costs and benefits of factor movement. Robert A. Mundell. "International Trade and Factor Mobility." American Economic Review 47 (1957), pp. 321-335. The paper that first laid out the argument that trade and factor movement can substitute for each other. Jeffrey Sachs. "The Current Account and Macroeconomic Adjustment in the 1970s." Brookings Papers on Economic Activity, 1981. A study of international capital flows that takes the approach of viewing such flows as intertemporal trade.

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International Factor Movements

APPENDIX TO CHAPTER 7

More on Intertemporal Trade This appendix contains a more detailed examination of the two-period intertemporal trade model described in the chapter. The concepts used are the same as those used in Chapter 5 to analyze international exchanges of different consumption goods at a single point in time. In the present setting, however, the trade model explains international patterns of investment and borrowing and the determination of the intertemporal terms of trade (that is, the real interest rate). First consider Home, whose intertemporal production possibility frontier is shown in Figure 7A-1. Recall that the quantities of present and future consumption goods produced at Home depend on the amount of present consumption goods invested to produce future goods. As currently available resources are diverted from present consumption to investment, production of present consumption, Qp, falls and production of future consumption, QF, rises. Increased investment therefore shifts the economy up and to the left along the intertemporal production possibility frontier. The chapter showed that the price of future consumption in terms of present consumption is 1/(1 + r), where r is the real interest rate. Measured in terms of present consumption, the value of the economy's total production over the two periods of its existence is therefore

Figure 7A-1 I Determining Home's Intertemporal Production Pattern At a world real interest rate of r, Home's investment level maximizes the value of production over the two periods that

Future consumption Isovalue lines with slope - (1 + r)

the economy exists.

Intertemporal production possibility frontier

QP Investment

Present consumption

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Figure 7A-1 shows the isovalue lines corresponding to the relative price 1/(1 + r) for different values of V. These are straight lines with slope —(1 + r) (because future consumption is on the vertical axis). As in the standard trade model, firms' decisions lead to a production pattern that maximizes the value of production at market prices, Qp + QF!{ 1 + r). Production therefore occurs at point Q. The economy invests the amount shown, leaving Qp available for present consumption and producing an amount QF of future consumption when the first-period investment pays off. Notice that at point Q, the extra future consumption that would result from investing an additional unit of present consumption just equals (1 + r). It would be inefficient to push investment beyond point Q because the economy could do better by lending additional present consumption to foreigners instead. Figure 7A-1 implies that a rise in the world real interest rate r, which steepens the isovalue lines, causes investment to fall. Figure 7A-2 shows how Home's consumption pattern is determined for a given world interest rate. Let DF and DF represent the demands for present and future consumption goods, respectively. Since production is at point Q, the economy's consumption possibilities over the two periods are limited by the intertemporal budget constraint: DFf(]

QFI(\ + r)

This constraint states that the value of Home's consumption over the two periods (measured in terms of present consumption) equals the value of consumption goods produced in the two periods (also measured in present consumption units). Put another way, production and consumption must lie on the same isovalue line.

'; Figure 7A-2 Determining Home's Intertemporal Consumption Pattern ' • j f w a w w t , "

1

,

1

,

1

'

••

•,'

• *

•

. • ' • . . •

• • • . . ' • • ' • , •

Home's consumption places it on the highest indifference curve

•.

•

•

•

. ••

.

Future consumption

Indifference curves

touching its intertemporal budget constraint. The economy exports Q p - Dp units of present consumption and imports DF — QF = Intertemporal budget constraint, DP+DF/0 +r) = QP+QF/(1 +r)

(I + r) x ( Q p - Dp) units of future consumption.

Imports